34 Se 78.971

Selenium

Category: Nonmetal | State: Solid

Atomic Properties

Atomic Number 34
Atomic Mass 78.971
Electronic Configuration [Ar] 3d¹⁰ 4s² 4p⁴

Periodic Table Placement

Group 16
Period 4
Block p-block

Physical Properties & Discovery

Melting Point 217°C
Boiling Point 684.9°C
Density 4.809 g/cm³
Discovered By Jöns Jacob Berzelius (1817)

Frequently Asked Questions about Selenium