Arsenic

Metalloids · Group 15 · Period 4

Atomic properties

Atomic number	33
Symbol	As
Standard atomic weight	74.922
Classification	Metalloids
Group	15
Period	4
Block	p-block
Electron configuration	[Ar] 3d10 4s2 4p3
Electronegativity (Pauling)	2.18
Common oxidation states	+5, +3, -3

Physical properties

Phase at 20 °C	Solid
Density	5.727 g/cm³
Melting point	817 °C
Boiling point	614 (subl.) °C
Discovered	Ancient
CAS number	—

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