Selenium

Selenium
Properties
Atomic symbol	Se
Atomic number	34
Classification	Non-metal
Atomic mass	79.0 amu
Other Information
Date of discovery	1817
Name of discoverer	Jöns Berzelius
Name origin	From the Greek word Selênê (Moon)
Uses	Photoelectric cells, TV cameras
Obtained from	Refining of lead, copper, nickel

Selenium(si-LEE-nee-em) is a conductive non-metal. It is primarily useful in electronic devices, especially in light-sensitive devices.

History[edit]

Selenium was discovered by a Swedish chemist named Jöns Jacob Berzelius, in 1817.^[1]

Additional Properties[edit]

Melting Point: 428.9 °F (220.5 °C or 493.65 K)

Boiling Point: 1265 °F (685 °C or 958 K)

Density: 4.809 grams per cubic centimeter

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

Color: gray^[3]

Uses[edit]

Selenium's electrical resistance is greatly affected by the amount of light shining on it. Bright light causes it to conduct better, while darkness reduces conductivity. This special property has made selenium useful in devices that respond to the intensity of light, such as electric eyes, photo cells, light meters for cameras and copiers. It is also is able to generate energy in direct sunlight. For this reason, it is a vital ingredient of solar cells.^[4] Selenium is also useful in converting alternating current to direct current, which is why it is used in rectifiers.

References[edit]

1. ↑ http://education.jlab.org/itselemental/ele034.html
2. ↑ http://education.jlab.org/itselemental/ele034.html
3. ↑ http://www.chemicalelements.com/elements/se.html
4. ↑ http://education.jlab.org/itselemental/ele034.html

External links[edit]

• https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional
• http://www.chemicalelements.com/elements/se.html

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