Name :  Selenium
Symbol :  Se
Atomic Number :  34
Atomic Weight :  78.96
Specific Heat :  0.32 J/gK
Melting Point :  217°C
Vaporization :  37.70 kJ/mol
Boiling Point :  684.9°C
Electronegativity :  2.55
Density@293 K :  4.79 g/cm³
Discovered :  Jöns Berzelius, Sweden, 1818
Description :  Soft metalloid similar to sulfur. Ranges from gray metallic to red glassy appearance.
Uses :  Light causes it to conduct electricity more easily. It is used in photoelectric cells, TV cameras, xerography machines and as a semiconductor in solar batteries and rectifiers. Also colors glass red.