Cobalt

From Conservapedia - Reading time: 2 min

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Cobalt
Properties
Atomic symbol	Co
Atomic number	27
Classification	Transition metal
Atomic mass	58.9 amu
Other Information
Date of discovery	1737
Name of discoverer	George Brandt
Name origin	From the German kobold.
Uses	In magnets, medical radio-isotopes and (as a compound) blue or green pigment in ceramics and glasses.
Obtained from	Cobaltine, erythrite, glaucodot, and skutterudite.

Cobalt (KO-bolt) is a lustrous, silvery-blue metal which is magnetic.^[1]

Properties[edit]

Melting Point: 2723 °F (1495 °C or 1768 K)

Boiling Point: 5301 °F (2927 °C or 3200 K)

Density: 8.86 grams per cubic centimeter

State of matter at Room Temperature: Solid^[2]

Cobalt is a hard, brittle metal, which is similar in appearance to iron and nickel.^[3]

History[edit]

The tomb of Pharaoh Tutankhamen, who ruled from 1361-1352 BC, contained a small glass object colored deep blue with cobalt. Cobalt blue was known even earlier in China and was used for pottery glazes.^[4] Modern cobalt was officially discovered by a Swedish chemist named Georg Brandt, in 1739.^[5]

Uses[edit]

Cobalt is used in several alloys, including Alnico. These alloys are used in things like jet turbines and gas turbine generators. Cobalt salts have been used for centuries to give pottery and other items a blue color. Radioactive cobalt-60 is also useful to treat cancer and in some countries, to irradiate food for preservation.^[6]

References[edit]

1. ↑ http://www.rsc.org/periodic-table/element/27/cobalt
2. ↑ http://education.jlab.org/itselemental/ele027.html
3. ↑ http://chemistry.about.com/od/elementfacts/a/cobalt.htm
4. ↑ http://www.rsc.org/periodic-table/element/27/cobalt
5. ↑ http://education.jlab.org/itselemental/ele027.html
6. ↑ http://www.rsc.org/periodic-table/element/27/cobalt

Periodic Table of the Elements
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
1 H 1.008																	2 He 4.003
3 Li 6.939	4 Be 9.0122											5 B 10.811	6 C 12.011	7 N 14.007	8 O 15.999	9 F 18.998	10 Ne 10.183
11 Na 22.99	12 Mg 24.312											13 Al 26.982	14 Si 28.086	15 P 30.974	16 S 32.064	17 Cl 35.453	18 Ar 39.948
19 K 39.102	20 Ca 40.08	21 Sc 44.956	22 Ti 47.9	23 V 50.942	24 Cr 51.996	25 Mn 54.938	26 Fe 55.847	27 Co 58.933	28 Ni 58.71	29 Cu 63.546	30 Zn 65.37	31 Ga 69.72	32 Ge 72.59	33 As 74.922	34 Se 78.96	35 Br 79.904	36 Kr 83.8
37 Rb 85.47	38 Sr 87.62	39 Y 88.905	40 Zr 91.22	41 Nb 92.906	42 Mo 95.94	43 Tc [97]	44 Ru 101.07	45 Rh 102.91	46 Pd 106.4	47 Ag 107.87	48 Cd 112.4	49 In 114.82	50 Sn 118.69	51 Sb 121.75	52 Te 127.6	53 I 126.9	54 Xe 131.3
55 Cs 132.91	56 Ba 137.34	57* La 138.91	72 Hf 178.49	73 Ta 180.95	74 W 183.85	75 Re 186.2	76 Os 190.2	77 Ir 192.2	78 Pt 195.09	79 Au 196.97	80 Hg 200.59	81 Tl 204.37	82 Pb 207.19	83 Bi 208.98	84 Po 210	85 At 210	86 Rn 222
87 Fr 215	88 Ra 226.03	89** Ac 227.03	104 Rf [261]	105 Db [262]	106 Sg [266]	107 Bh [264]	108 Hs [265]	109 Mt [268]	110 Dt [271]	111 Rg [272]	112 Cn [277]	113 Nh [284]	114 Fv [289]	115 Mc [288]	116 Lv [292]	117 Ts [293]	118 Og [294]
*Lanthanides		58 Ce 140.12	59 Pr 140.91	60 Nd 144.24	61 Pm 145	62 Sm 150.35	63 Eu 151.96	64 Gd 157.25	65 Tb 158.92	66 Dy 162.5	67 Ho 164.93	68 Er 167.26	69 Tm 168.93	70 Yb 173.04	71 Lu 174.97
**Actinides		90 Th 232.04	91 Pa 231	92 U 238.03	93 Np 237.05	94 Pu 239.05	95 Am 241.06	96 Cm 244.06	97 Bk 249.08	98 Cf 252.08	99 Es 252.08	100 Fm 257.1	101 Md 258.1	102 No 259.1	103 Lr 262.11