Symbol	Se	Atomic radius: pm	116	Fusion: kJ/Mole	6.69
Name	Selenium	Ionic radius: pm	(-2)198	Boiling point: °C	685
Atomic number	34	Electron affinity	2.02	Melting point: °C	221
Atomic weight	78.96	1st  ion potential	9.75	Specific Heat Cap: J/(g K)	0.32
Classification	Non-Metal	Natural form	Solid	Thermal Cond: W/(cm K)	0.02
Configuration	[Ar]3d104s2p4	Crystal structure	Hex	Electrical Cond	1x10-12
Oxidation states	+/-2,4,6	Density	4.80	Abundance: mg/kg-crust	0.05
Electronegativity	2.55	Vaporization: kJ/Mole	95.48
Selenium was recognized as an element in 1818 by Jöns Jacob Berzelius, a Swedish chemist.			Uses - xerography, medicines, photoelectric cells, TV cameras, photographic toner