Se	Z =  34	◊ ◊ ◊ ◊ ◊	Selenium
			From the Greek "selene", meaning "moon"
(AM) Atomic Mass	78.96  amu	♦	Oxidation States	+2, +4, +6, -2
(BP) Boiling Point	685  °C	♦	(MP) Melting Point	217  °C
(ρ) Density	4.82  g/cm3	♦	Crystal Structure	Hexagonal
( χ ) Electronegativity	2.4	♦	(AR) Atomic Radius	1.16  Å
Physical State	Solid	♦	(C) Heat Capacity	0.321  J/g °C
Electronic-Config	[Ar]  3d10  4s2  4p4	♦	(I1) First Ionization E	940.92  kJ/mol
(ΔHvap) Heat of Vaporization	95.48  kJ/mol	♦	(ΔHfus) Heat of Fusion	6.69  kJ/mol
Year of Discovery	1826	♦	Location of Discovery	Sweden
(E°) Standard Potential	H2SeO3 + 4 H+⇔ Se + 3 H2O (0.740 V),  Se⇔ Se-2 (-0.920 V)
Stable isotopes	74Se,  76Se,  77Se,  78Se,  80Se
Discovered/Synthesized by	Jöns Jacob Berzelius
Natural Source	Isolated by the recoverey from copper processing
Common Uses	Semiconductors, photocopiers, laser printers, photocells, red glass, dandruff shampoo, rubber
Other Info	Used in photovoltaic cells and in shampoos Can convert light to electricity
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