As
Arsenic
Z 33 74.922 g/molMetalloid
Nucleus
33 Protons
42 Neutrons
33 Electrons (5 Valence)
Shell distribution: K2 • L8 • M18 • N5 • O0 • P0 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Ar]3d104s24p3
Oxidation States
CommonRare
0
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Radii
Empirical
115 pm1.15 Å
Calculated
114 pm1.14 Å
Covalent
119±4 pm1.19±0.04 Å
Van der Waals
185 pm1.85 Å
IonicAs3-
222 pm2.22 Å
Crystal Structure
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RhombohedralStandard state
Pearson symbol
hR2
Space group
R3m No. 166
Density
5.727 g/cm³