Selenium

Properties

Atomic Number

34

Atomic Symbol

Se

Atomic Mass

78.96

CAS No.

7782-49-2

Density

4.819 g/cm³

Series

other nonmetal

Melting Point

221°C

Boiling Point

685°C

Thermal Conductivity

0.52 W/cm °C

Heat of Fusion

5.4 kJ/mol

Heat of Vaporization

26 kJ/mol

Electronegativity

2.55 pauling

Crystal Structure

Monoclinic