Compare Element Properties

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Property	Se Selenium	? N/A
Atomic number	34	N/A
Symbol	Se	N/A
Name	Selenium	N/A
Category	nonmetal	N/A
Standard Atomic Weight	78.971 u	N/A
Period	4	N/A
Group	16	N/A
Block	p	N/A
Phase at STP	solid	N/A
Electron configuration	[Ar]4s23d104p4	N/A
Oxidation states	[-2, -1, 0, 1, 2, 3, 4, 5, 6]	N/A
Electronegativity (Pauling)	2.55	N/A
Electron affinity	2.0206 eV	N/A
Density	4809 kg/m³	N/A
Melting point	220.5 °C	N/A
Boiling point	684.85 °C	N/A
Discovery year	1817	N/A