33
74.922 u
As
Arsenic
Metalloid
Atomic Structure
Physical State
Group
15
Period
4
Block
p
Electron Configuration
[Ar] 3d¹⁰ 4s² 4p³
Physical Properties
Atomic Mass:
74.922 u
Electronegativity:
2.18
Atomic Radius:
185 pm
Ionization Energy:
9.815 eV
Density:
5.776 g/cm³
Melting Point:
1090 K
Boiling Point:
887 K
Historical Information
Discovered By:
Ancient
Year Discovered:
Unknown