Selenium

Se Selenium Non-Metal

 

Atomic number:  34 Atomic weight:  78.96
Shells:  2,8,18,6 Orbitals:  [Ar] 3d10 4s2 4p4
Melting point:  217°C Boiling point:  684.9°C
Covalent radius:  1.16 Å Atomic volume:  16.45 cm³/mol
Atomic radius:  1.22 Å Ionic radius:  .50 (+4) Å
Electronegativity:  2.55 Oxidation states:  -2,(4),6
1st ionization pot.:  9.7524 V 2nd ionization pot.:  21.19 V
3rd ionization pot.:  30.82 V Specific heat:  0.32 J/gK
Heat of fusion:  6.694 kJ/mol Heat of vapor.:  37.70 kJ/mol
Thermal conduct.:  0.0204 W/cmK Electrical conduct.:  1.0e-12 10^6/cm ohm
Density:  4.79 g/cm³ Valence:  -2,4,6