Ar
Argon
Z 18 39.95 g/molNoble Gas
Nucleus
18 Protons
22 Neutrons
18 Electrons (8 Valence)
Shell distribution: K2 • L8 • M8 • N0 • 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
[Ne]3s23p6
Radii
Empirical
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Calculated
71 pm0.71 Å
Covalent
106±10 pm1.06±0.1 Å
van Der Waals
188 pm1.88 Å
Oxidation States
CommonRare
0
0
Crystal Structure
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Face-centered Cubic