Periodic Table
86
Rn
222
Radon
Noble GasRadioactive noble gas; health hazard in basements.
Electronic Configuration
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
18e⁻n=5
8e⁻n=6
Properties
Atomic number
86
Atomic mass
222 u
Category
Noble Gas
Block / Group / Period
p · 18 · 6
Valence electrons
8
Oxidation states
0, +2
Electronegativity
2.2
Atomic radius
120 pm
Ionization energy
1037 kJ/mol
Electron affinity
0 kJ/mol
Melting point
202 K / -71 °C
Boiling point
211 K / -62 °C
Density
0.00973 g/cm³
State at 25 °C
gas
Personal Notes
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