Rutherfordium

Rutherfordium is a synthetic chemical element; it has symbol Rf and atomic number 104\. It is named after physicist Ernest Rutherford. As a synthetic element, it is not found in nature and can only be made in a particle accelerator. It is radioactive; the most stable known isotope, 267Rf, has a half-life of about 48 minutes.

In the periodic table, it is a d-block element and the second of the fourth-row transition elements. It is in period 7 and is a group 4 element. Chemistry experiments have confirmed that rutherfordium behaves as the heavier homolog to hafnium in group 4. The chemical properties of rutherfordium are characterized only partly. They compare well with the other group 4 elements, even though some calculations had indicated that the element might show significantly different properties due to relativistic effects.

In the 1960s, small amounts of rutherfordium were produced at Joint Institute for Nuclear Research in the Soviet Union and at Lawrence Berkeley National Laboratory in California.[1] Priority of discovery and hence the name of the element was disputed between Soviet and American scientists, and it was not until 1997 that the International Union of Pure and Applied Chemistry (IUPAC) established rutherfordium as the official name of the element.

## Contents

* 1 Introduction
* 2 History
* 2.1 Discovery
* 2.2 Naming controversy
* 3 Isotopes
* 3.1 Stability and half-lives
* 4 Predicted properties
* 4.1 Chemical
* 4.2 Physical and atomic
* 5 Experimental chemistry
* 5.1 Gas phase
* 5.2 Aqueous phase
* 6 Notes
* 7 References
* 8 Bibliography
* 9 External links

## Introduction

This section is an excerpt from Superheavy element § Introduction[ edit ]

## History

### Discovery

Rutherfordium was reportedly first detected in 1964 at the Joint Institute for Nuclear Research at Dubna (Soviet Union at the time). Researchers there bombarded a plutonium-242 target with neon-22 ions; a spontaneous fission activity with half-life 0.3 ± 0.1 seconds was detected and assigned to 260104\. Later work found no isotope of element 104 with this half-life, so that this assignment must be considered incorrect.[2]

In 1966–1969, the experiment was repeated. This time, the reaction products by gradient thermochromatography after conversion to chlorides by interaction with ZrCl4. The team identified spontaneous fission activity contained within a volatile chloride portraying eka-hafnium properties.[2]

24294Pu \+ 2210Ne → 264−x104 → 264−x104Cl4

The researchers considered the results to support the 0.3 second half-life. Although it is now known that there is no isotope of element 104 with such a half-life, the chemistry does fit that of element 104, as chloride volatility is much greater in group 4 than in group 3 (or the actinides).[2]

In 1969, researchers at University of California, Berkeley conclusively synthesized the element by bombarding a californium-249 target with carbon-12 ions and measured the alpha decay of 257104, correlated with the daughter decay of nobelium-253:[3]

24998Cf \+ 126C → 257104 + 4 n

They were unable to confirm the 0.3-second half-life for 260104, and instead found a 10–30 millisecond half-life for this isotope, agreeing with the modern value of 21 milliseconds. In 1970, the American team chemically identified element 104 using the ion-exchange separation method, proving it to be a group 4 element and the heavier homologue of hafnium.[4]

The American synthesis was independently confirmed in 1973 and secured the identification of rutherfordium as the parent by the observation of K-alpha X-rays in the elemental signature of the 257104 decay product, nobelium-253.[5]

### Naming controversy

Main article: Chemistry:Transfermium Wars

Element 104 was eventually named after Ernest Rutherford Igor Kurchatov

As a consequence of the initial competing claims of discovery, an element naming controversy arose. Since the Soviets claimed to have first detected the new element they suggested the name kurchatovium (Ku) in honor of Igor Kurchatov (1903–1960), former head of Soviet nuclear research. This name had been used in books of the Soviet Bloc as the official name of the element. The Americans, however, proposed rutherfordium (Rf) for the new element to honor New Zealand physicist Ernest Rutherford, who is known as the "father" of nuclear physics.[6] In 1992, the IUPAC/IUPAP Transfermium Working Group (TWG) assessed the claims of discovery and concluded that both teams provided contemporaneous evidence to the synthesis of element 104 in 1969, and that credit should be shared between the two groups. In particular, this involved the TWG performing a new retrospective reanalysis of the Russian work in the face of the later-discovered fact that there is no 0.3-second isotope of element 104: they reinterpreted the Dubna results as having been caused by a spontaneous fission branch of 259104.[2]

The American group wrote a scathing response to the findings of the TWG, stating that they had given too much emphasis on the results from the Dubna group. In particular they pointed out that the Russian group had altered the details of their claims several times over a period of 20 years, a fact that the Russian team does not deny. They also stressed that the TWG had given too much credence to the chemistry experiments performed by the Russians, considered the TWG's retrospective treatment of the Russian work based on unpublished documents to have been "highly irregular", noted that there was no proof that 259104 had a spontaneous fission branch at all[4] (as of 2021 there still is not),[7] and accused the TWG of not having appropriately qualified personnel on the committee. The TWG responded by saying that this was not the case and having assessed each point raised by the American group said that they found no reason to alter their conclusion regarding priority of discovery.[4]

The International Union of Pure and Applied Chemistry (IUPAC) adopted unnilquadium (Unq) as a temporary, systematic element name, derived from the Latin names for digits 1, 0, and 4. In 1994, IUPAC suggested a set of names for elements 104 through 109, in which dubnium (Db) became element 104 and rutherfordium became element 106.[8] This recommendation was criticized by the American scientists for several reasons. Firstly, their suggestions were scrambled: the names rutherfordium and hahnium, originally suggested by Berkeley for elements 104 and 105, were respectively reassigned to elements 106 and 108. Secondly, elements 104 and 105 were given names favored by JINR, despite earlier recognition of LBL as an equal co-discoverer for both of them. Thirdly and most importantly, IUPAC rejected the name seaborgium for element 106, having just approved a rule that an element could not be named after a living person, even though the IUPAC had given the LBNL team the sole credit for its discovery.[9] In 1997, IUPAC renamed elements 104 to 109, and gave elements 104 and 106 the Berkeley proposals rutherfordium and seaborgium. The name dubnium was given to element 105 at the same time. The 1997 names were accepted by researchers and became the standard.[10]

## Isotopes

Main article: Physics:Isotopes of rutherfordium

Rutherfordium has no stable or naturally occurring isotopes. Several radioactive isotopes have been synthesized in the laboratory, either by fusing two atoms or by observing the decay of heavier elements. Seventeen different isotopes have been reported with atomic masses from 252 to 270 (with the exceptions of 264 and 269). Most of these decay predominantly through spontaneous fission, particularly isotopes with even neutron numbers, while some of the lighter isotopes with odd neutron numbers also have significant alpha decay branches.[11][12]

### Stability and half-lives

Out of isotopes whose half-lives are known, the lighter isotopes usually have shorter half-lives. The three lightest known isotopes have half-lives of under 50 μs, with the lightest reported isotope 252Rf having a half-life shorter than one microsecond.[13][14] The isotopes 256Rf, 258Rf, 260Rf are more stable at around 10 ms; 255Rf, 257Rf, 259Rf, and 262Rf live between 1 and 5 seconds; and 261Rf, 265Rf, and 263Rf are more stable, at around 1.1, 1.5, and 10 minutes respectively. The most stable known isotope, 267Rf, is one of the heaviest, and has a half-life of about 48 minutes.[15] Rutherfordium isotopes with an odd neutron number tend to have longer half-lives than their even–even neighbors because the odd neutron provides additional hindrance against spontaneous fission.

The lightest isotopes were synthesized by direct fusion between two lighter nuclei and as decay products. The heaviest isotope produced by direct fusion is 262Rf; heavier isotopes have only been observed as decay products of elements with larger atomic numbers. The heavy isotopes 266Rf and 268Rf have also been reported as electron capture daughters of the dubnium isotopes 266Db and 268Db, but have short half-lives to spontaneous fission. It seems likely that the same is true for 270Rf, a possible daughter of 270Db.[16] These three isotopes remain unconfirmed.

In 1999, American scientists at the University of California, Berkeley, announced that they had succeeded in synthesizing three atoms of 293Og.[17] These parent nuclei were reported to have successively emitted seven alpha particles to form 265Rf nuclei, but their claim was retracted in 2001.[18] This isotope was later discovered in 2010 as the final product in the decay chain of 285Fl.[19]

## Predicted properties

Very few properties of rutherfordium or its compounds have been measured; this is due to its extremely limited and expensive production[20] and the fact that rutherfordium (and its parents) decays very quickly. A few singular chemistry-related properties have been measured, but properties of rutherfordium metal remain unknown and only predictions are available.

### Chemical

Rutherfordium is the first transactinide element and the second member of the 6d series of transition metals. Calculations on its ionization potentials, atomic radius, as well as radii, orbital energies, and ground levels of its ionized states are similar to that of hafnium and very different from that of lead. Therefore, it was concluded that rutherfordium's basic properties will resemble those of other group 4 elements, below titanium, zirconium, and hafnium.[21][22] Some of its properties were determined by gas-phase experiments and aqueous chemistry. The oxidation state +4 is the only stable state for the latter two elements and therefore rutherfordium should also exhibit a stable +4 state.[22] In addition, rutherfordium is also expected to be able to form a less stable +3 state.[23] The standard reduction potential of the Rf4+/Rf couple is predicted to be higher than −1.7 V.[24]

Initial predictions of the chemical properties of rutherfordium were based on calculations which indicated that the relativistic effects on the electron shell might be strong enough that the 7p orbitals would have a lower energy level than the 6d orbitals, giving it a valence electron configuration of 6d1 7s2 7p1 or even 7s2 7p2, therefore making the element behave more like lead than hafnium. With better calculation methods and experimental studies of the chemical properties of rutherfordium compounds it could be shown that this does not happen and that rutherfordium instead behaves like the rest of the group 4 elements.[23][22] Later it was shown in ab initio calculations with the high level of accuracy[25][26][27] that the Rf atom has the ground state with the 6d2 7s2 valence configuration and the low-lying excited 6d1 7s2 7p1 state with the excitation energy of only 0.3–0.5 eV.

In an analogous manner to zirconium and hafnium, rutherfordium is projected to form a very stable, refractory oxide, RfO2. It reacts with halogens to form tetrahalides, RfX4, which hydrolyze on contact with water to form oxyhalides RfOX2. The tetrahalides are volatile solids existing as monomeric tetrahedral molecules in the vapor phase.[22]

In the aqueous phase, the Rf4+ ion hydrolyzes less than titanium(IV) and to a similar extent as zirconium and hafnium, thus resulting in the RfO2+ ion. Treatment of the halides with halide ions promotes the formation of complex ions. The use of chloride and bromide ions produces the hexahalide complexes RfCl2−6 and RfBr2−6. For the fluoride complexes, zirconium and hafnium tend to form hepta- and octa- complexes. Thus, for the larger rutherfordium ion, the complexes RfF2−6, RfF3−7 and RfF4−8 are possible.[22]

### Physical and atomic

<section begin=properties /> Rutherfordium is expected to be a solid under normal conditions and have a hexagonal close-packed crystal structure (c/a = 1.61), similar to its lighter congener hafnium.[28] It should be a metal with density ~17 g/cm3.[29][30] The atomic radius of rutherfordium is expected to be ~150 pm. Due to relativistic stabilization of the 7s orbital and destabilization of the 6d orbital, Rf+ and Rf2+ ions are predicted to give up 6d electrons instead of 7s electrons, which is the opposite of the behavior of its lighter homologs.[23] When under high pressure (variously calculated as 72 or ~50 GPa), rutherfordium is expected to transition to body-centered cubic crystal structure; hafnium transforms to this structure at 71±1 GPa, but has an intermediate ω structure that it transforms to at 38±8 GPa that should be lacking for rutherfordium.[31]<section end=properties />

## Experimental chemistry

### Gas phase

The tetrahedral structure of the RfCl4 molecule

Early work on the study of the chemistry of rutherfordium focused on gas thermochromatography and measurement of relative deposition temperature adsorption curves. The initial work was carried out at Dubna in an attempt to reaffirm their discovery of the element. Recent work is more reliable regarding the identification of the parent rutherfordium radioisotopes. The isotope 261mRf has been used for these studies,[22] though the long-lived isotope 267Rf (produced in the decay chain of 291Lv, 287Fl, and 283Cn) may be advantageous for future experiments.[32] The experiments relied on the expectation that rutherfordium would be a 6d element in group 4 and should therefore form a volatile molecular tetrachloride, that would be tetrahedral in shape.[22][33][34] Rutherfordium(IV) chloride is more volatile than its lighter homologue hafnium(IV) chloride (HfCl4) because its bonds are more covalent.[23]

A series of experiments confirmed that rutherfordium behaves as a typical member of group 4, forming a tetravalent chloride (RfCl4) and bromide (RfBr4) as well as an oxychloride (RfOCl2). A decreased volatility was observed for RfCl4 when potassium chloride is provided as the solid phase instead of gas, highly indicative of the formation of nonvolatile K2RfCl6 mixed salt.[21][22][35]

### Aqueous phase

Rutherfordium is expected to have the electron configuration [Rn]5f14 6d2 7s2 and therefore behave as the heavier homologue of hafnium in group 4 of the periodic table. It should therefore readily form a hydrated Rf4+ ion in strong acid solution and should readily form complexes in hydrochloric acid, hydrobromic or hydrofluoric acid solutions.[22]

The most conclusive aqueous chemistry studies of rutherfordium have been performed by the Japanese team at Japan Atomic Energy Research Institute using the isotope 261mRf. Extraction experiments from hydrochloric acid solutions using isotopes of rutherfordium, hafnium, zirconium, as well as the pseudo-group 4 element thorium have proved a non-actinide behavior for rutherfordium. A comparison with its lighter homologues placed rutherfordium firmly in group 4 and indicated the formation of a hexachlororutherfordate complex in chloride solutions, in a manner similar to hafnium and zirconium.[22][36]

261mRf4+ \+ 6 Cl− → [261mRfCl6]2−

Very similar results were observed in hydrofluoric acid solutions. Differences in the extraction curves were interpreted as a weaker affinity for fluoride ion and the formation of the hexafluororutherfordate ion, whereas hafnium and zirconium ions complex seven or eight fluoride ions at the concentrations used:[22]

261mRf4+ \+ 6 F− → [261mRfF6]2−

Experiments performed in mixed sulfuric and nitric acid solutions shows that rutherfordium has a much weaker affinity towards forming sulfate complexes than hafnium. This result is in agreement with predictions, which expect rutherfordium complexes to be less stable than those of zirconium and hafnium because of a smaller ionic contribution to the bonding. This arises because rutherfordium has a larger ionic radius (76 pm) than zirconium (71 pm) and hafnium (72 pm), and also because of relativistic stabilisation of the 7s orbital and destabilisation and spin–orbit splitting of the 6d orbitals.[37]

Coprecipitation experiments performed in 2021 studied rutherfordium's behaviour in basic solution containing ammonia or sodium hydroxide, using zirconium, hafnium, and thorium as comparisons. It was found that rutherfordium does not strongly coordinate with ammonia and instead coprecipitates out as a hydroxide, which is probably Rf(OH)4.[38]

## Notes

## References

1. ↑ "Rutherfordium - Element information, properties and uses | Periodic Table". http://www.rsc.org/periodic-table/element/104/rutherfordium.
2. ↑ 2.0 2.1 2.2 2.3 Barber, R. C.; Greenwood, N. N.; Hrynkiewicz, A. Z.; Jeannin, Y. P.; Lefort, M.; Sakai, M.; Ulehla, I.; Wapstra, A. P. et al. (1993). "Discovery of the transfermium elements. Part II: Introduction to discovery profiles. Part III: Discovery profiles of the transfermium elements". Pure and Applied Chemistry 65 (8): 1757–1814. doi:10.1351/pac199365081757.
3. ↑ Ghiorso, A.; Nurmia, M.; Harris, J.; Eskola, K.; Eskola, P. (1969). "Positive Identification of Two Alpha-Particle-Emitting Isotopes of Element 104". Physical Review Letters 22 (24): 1317–1320. doi:10.1103/PhysRevLett.22.1317. Bibcode: 1969PhRvL..22.1317G. https://cloudfront.escholarship.org/dist/prd/content/qt3fm666nq/qt3fm666nq.pdf. Retrieved 2019-04-05.
4. ↑ 4.0 4.1 4.2 Ghiorso, A.; Seaborg, G. T.; Organessian, Yu. Ts.; Zvara, I.; Armbruster, P.; Hessberger, F. P.; Hofmann, S.; Leino, M. et al. (1993). "Responses on 'Discovery of the transfermium elements' by Lawrence Berkeley Laboratory, California; Joint Institute for Nuclear Research, Dubna; and Gesellschaft fur Schwerionenforschung, Darmstadt followed by reply to responses by the Transfermium Working Group". Pure and Applied Chemistry 65 (8): 1815–1824. doi:10.1351/pac199365081815.
5. ↑ Bemis, C. E.; Silva, R.; Hensley, D.; Keller, O.; Tarrant, J.; Hunt, L.; Dittner, P.; Hahn, R. et al. (1973). "X-Ray Identification of Element 104". Physical Review Letters 31 (10): 647–650. doi:10.1103/PhysRevLett.31.647. Bibcode: 1973PhRvL..31..647B.
6. ↑ "Rutherfordium". Rsc.org. http://www.rsc.org/chemistryworld/podcast/Interactive_Periodic_Table_Transcripts/Rutherfordium.asp.
7. ↑ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties". Chinese Physics C 45 (3). doi:10.1088/1674-1137/abddae. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf.
8. ↑ "Names and symbols of transfermium elements (IUPAC Recommendations 1994)". Pure and Applied Chemistry 66 (12): 2419–2421. 1994. doi:10.1351/pac199466122419. https://www.iupac.org/publications/pac-2007/1994/pdf/6612x2419.pdf. Retrieved September 7, 2016.
9. ↑ Yarris, L. (1994). "Naming of element 106 disputed by international committee". http://www2.lbl.gov/Science-Articles/Archive/seaborgium-dispute.html.
10. ↑ "Names and symbols of transfermium elements (IUPAC Recommendations 1997)". Pure and Applied Chemistry 69 (12): 2471–2474. 1997. doi:10.1351/pac199769122471.
11. ↑ Sonzogni, Alejandro. "Interactive Chart of Nuclides". National Nuclear Data Center: Brookhaven National Laboratory. http://www.nndc.bnl.gov/chart/reCenter.jsp?z=104&n=158.
12. ↑ "Six New Isotopes of the Superheavy Elements Discovered". 26 October 2010. https://newscenter.lbl.gov/2010/10/26/six-new-isotopes/.
13. ↑ Khuyagbaatar, J.; Mosat, P.; Ballof, J. et al. (2025). "Stepping into the sea of instability: The new sub-𝜇s superheavy nucleus 252Rf". Physical Review Letters 134 (22501). doi:10.1103/PhysRevLett.134.022501. PMID 39913845.
14. ↑ Lopez-Martens, A.; Hauschild, K.; Svirikhin, A. I. et al. (22 February 2022). "Fission properties of Rf 253 and the stability of neutron-deficient Rf isotopes" (in en). Physical Review C 105 (2). doi:10.1103/PhysRevC.105.L021306. ISSN 2469-9985. https://journals.aps.org/prc/pdf/10.1103/PhysRevC.105.L021306. Retrieved 16 June 2023.
15. ↑ Oganessian, Yu. Ts.Expression error: Unrecognized word "et". (2022). "Investigation of 48Ca-induced reactions with 242Pu and 238U targets at the JINR Superheavy Element Factory". Physical Review C 106 (24612). doi:10.1103/PhysRevC.106.024612. Bibcode: 2022PhRvC.106b4612O.
16. ↑ Stock, Reinhard (13 September 2013). Encyclopedia of Nuclear Physics and its Applications. John Wiley & Sons. p. 305. ISBN 978-3-527-64926-6. OCLC 867630862. https://books.google.com/books?id=zVrdAAAAQBAJ&pg=PT305.
17. ↑ Ninov, Viktor (1999). "Observation of Superheavy Nuclei Produced in the Reaction of The element Chemistry:Krypton does not exist. with The element Chemistry:Lead does not exist.". Physical Review Letters 83 (6): 1104–1107. doi:10.1103/PhysRevLett.83.1104. Bibcode: 1999PhRvL..83.1104N. https://zenodo.org/record/1233919. Retrieved 2018-11-04.The+element+Chemistry:Krypton+does+not+exist.[[Category:Pages+with+incorrect+formatting+templates+use]]+with+[[Category:Pages+with+incorrect+nuclide+templates+use]]The+element+Chemistry:Lead+does+not+exist.[[Category:Pages+with+incorrect+formatting+templates+use]]&rft.jtitle=[[Physics:Physical+Review+Letters|Physical+Review+Letters]]&rft.aulast=Ninov&rft.aufirst=Viktor&rft.au=Ninov, Viktor&rft.date=1999&rft.volume=83&rft.issue=6&rft.pages=1104–1107&rft_id=info:doi/10.1103/PhysRevLett.83.1104&rft_id=info:bibcode/1999PhRvL..83.1104N&rft_id=https://zenodo.org/record/1233919&rfr_id=info:sid/en.wikibooks.org:Chemistry:Rutherfordium">
18. ↑ "Results of Element 118 Experiment Retracted". 2001-07-21. http://enews.lbl.gov/Science-Articles/Archive/118-retraction.html.
19. ↑ Ellison, P. et al. (2010). "New Superheavy Element Isotopes: 242Pu(48Ca,5n)285114". Physical Review Letters 105 (18). doi:10.1103/PhysRevLett.105.182701. PMID 21231101. Bibcode: 2010PhRvL.105r2701E. https://digital.library.unt.edu/ark:/67531/metadc831769/. Retrieved 2019-07-14.
20. ↑ Subramanian, S.. "Making New Elements Doesn't Pay. Just Ask This Berkeley Scientist". https://www.bloomberg.com/news/features/2019-08-28/making-new-elements-doesn-t-pay-just-ask-this-berkeley-scientist.
21. ↑ 21.0 21.1 Kratz, J. V.; Nähler, A.; Rieth, U.; Kronenberg, A.; Kuczewski, B.; Strub, E.; Brüchle, W.; Schädel, M. et al. (2003). "An EC-branch in the decay of 27-s263Db: Evidence for the new isotope 263Rf". Radiochim. Acta 91 (1–2003): 59–62. doi:10.1524/ract.91.1.59.19010. http://www.ulrich-rieth.de/publikationen/RCA0301_059.PDF.
22. ↑ 22.00 22.01 22.02 22.03 22.04 22.05 22.06 22.07 22.08 22.09 22.10 Kratz, J. V. (2003). "Critical evaluation of the chemical properties of the transactinide elements (IUPAC Technical Report)". Pure and Applied Chemistry 75 (1): 103. doi:10.1351/pac200375010103. http://stage.iupac.org/originalWeb/publications/pac/2003/pdf/7501x0103.pdf.
23. ↑ 23.0 23.1 23.2 23.3 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Haire`
24. ↑ Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties". Recent Impact of Physics on Inorganic Chemistry. Structure and Bonding 21: 89–144. doi:10.1007/BFb0116498. ISBN 978-3-540-07109-9. https://www.researchgate.net/publication/225672062. Retrieved 4 October 2013.
25. ↑ Eliav, E.; Kaldor, U.; Ishikawa, Y. (1995). "Ground State Electron Configuration of Rutherfordium: Role of Dynamic Correlation". Physical Review Letters 74 (7): 1079–1082. doi:10.1103/PhysRevLett.74.1079. PMID 10058929. Bibcode: 1995PhRvL..74.1079E.
26. ↑ Mosyagin, N. S.; Tupitsyn, I. I.; Titov, A. V. (2010). "Precision Calculation of the Low-Lying Excited States of the Rf Atom". Radiochemistry 52 (4): 394–398. doi:10.1134/S1066362210040120. Bibcode: 2010Radch..52..394M.
27. ↑ Dzuba, V. A.; Safronova, M. S.; Safronova, U. I. (2014). "Atomic properties of superheavy elements No, Lr, and Rf". Physical Review A 90 (1). doi:10.1103/PhysRevA.90.012504. Bibcode: 2014PhRvA..90a2504D.
28. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `hcp`
29. ↑ Gyanchandani, Jyoti; Sikka, S. K. (10 May 2011). "Physical properties of the 6 d -series elements from density functional theory: Close similarity to lighter transition metals". Physical Review B 83 (17). doi:10.1103/PhysRevB.83.172101. Bibcode: 2011PhRvB..83q2101G.
30. ↑ Kratz; Lieser (2013). Nuclear and Radiochemistry: Fundamentals and Applications (3rd ed.). p. 631.
31. ↑ Gyanchandani, Jyoti; Sikka, S.K. (2012). "Structural properties of rutherfordium: An ab-initio study". Physics Letters A 376 (4): 620–625. doi:10.1016/j.physleta.2011.11.053. Bibcode: 2012PhLA..376..620G.
32. ↑ Moody, Ken (2013-11-30). "Synthesis of Superheavy Elements". in Schädel, Matthias; Shaughnessy, Dawn. The Chemistry of Superheavy Elements (2nd ed.). Springer Science & Business Media. pp. 24–8. ISBN 978-3-642-37466-1.
33. ↑ Oganessian, Yury Ts; Dmitriev, Sergey N. (2009). "Superheavy elements in D I Mendeleev's Periodic Table". Russian Chemical Reviews 78 (12): 1077. doi:10.1070/RC2009v078n12ABEH004096. Bibcode: 2009RuCRv..78.1077O.
34. ↑ Türler, A.; Buklanov, G. V.; Eichler, B.; Gäggeler, H. W.; Grantz, M.; Hübener, S.; Jost, D. T.; Lebedev, V. Ya. et al. (1998). "Evidence for relativistic effects in the chemistry of element 104". Journal of Alloys and Compounds 271–273: 287. doi:10.1016/S0925-8388(98)00072-3.
35. ↑ Gäggeler, Heinz W. (2007-11-05). "Lecture Course Texas A&M: Gas Phase Chemistry of Superheavy Elements". http://lch.web.psi.ch/files/lectures/TexasA&M/TexasA&M.pdf.
36. ↑ Nagame, Y. et al. (2005). "Chemical studies on rutherfordium (Rf) at JAERI". Radiochimica Acta 93 (9–10_2005): 519. doi:10.1524/ract.2005.93.9-10.519. http://wwwsoc.nii.ac.jp/jnrs/paper/JN62/jn6202.pdf.
37. ↑ Li, Z. J.; Toyoshima, A.; Asai, M. et al. (2012). "Sulfate complexation of element 104, Rf, in H2SO4/HNO3 mixed solution". Radiochimica Acta 100 (3): 157–164. doi:10.1524/ract.2012.1898.
38. ↑ Kasamatsu, Yoshitaka; Toyomura, Keigo; Haba, Hiromitsu et al. (2021). "Co-precipitation behaviour of single atoms of rutherfordium in basic solutions". Nature Chemistry 13 (3): 226–230. doi:10.1038/s41557-020-00634-6. PMID 33589784. Bibcode: 2021NatCh..13..226K.

## Bibliography

* Audi, G.; Kondev, F. G.; Wang, M. et al. (2017). "The NUBASE2016 evaluation of nuclear properties". Chinese Physics C 41 (3). doi:10.1088/1674-1137/41/3/030001. Bibcode: 2017ChPhC..41c0001A.
* Beiser, A. (2003). Concepts of modern physics (6th ed.). McGraw-Hill. ISBN 978-0-07-244848-1. OCLC 48965418.
* Hoffman, D. C.; Ghiorso, A.; Seaborg, G. T. (2000). The Transuranium People: The Inside Story. World Scientific. ISBN 978-1-78-326244-1.
* Kragh, H. (2018). From Transuranic to Superheavy Elements: A Story of Dispute and Creation. Springer. ISBN 978-3-319-75813-8.
* Zagrebaev, V.; Karpov, A.; Greiner, W. (2013). "Future of superheavy element research: Which nuclei could be synthesized within the next few years?". Physics:Journal of Physics: Conference Series 420 (1). doi:10.1088/1742-6596/420/1/012001. ISSN 1742-6588. Bibcode: 2013JPhCS.420a2001Z.

## External links

* Rutherfordium at The Periodic Table of Videos (University of Nottingham)
* WebElements.com – Rutherfordium

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4 | K | Ca |  | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr
5 | Rb | Sr |  | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe
6 | Cs | Ba | La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn
7 | Fr | Ra | Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og

| Alkali metal | Alkaline earth metal | Lan­thanide | Actinide | Transition metal | Post-​transition metal | Metalloid | Reactive nonmetal | Noble gas

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Original source: https://en.wikipedia.org/wiki/Rutherfordium. Read more

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