Periodic Table
33
As
74.922
Arsenic
MetalloidToxic metalloid; sublimes; As₂O₃ poison; Marsh test.
Electronic Configuration
[Ar] 3d¹⁰ 4s² 4p³or1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
5e⁻n=4
Properties
Atomic number
33
Atomic mass
74.922 u
Category
Metalloid
Block / Group / Period
p · 15 · 4
Valence electrons
5
Oxidation states
-3, +3, +5
Electronegativity
2.18
Atomic radius
114 pm
Ionization energy
947 kJ/mol
Electron affinity
78 kJ/mol
Melting point
1090 K / 817 °C
Boiling point
887 K / 614 °C
Density
5.776 g/cm³
State at 25 °C
solid
Personal Notes
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