Periodic Table
84
Po
209
Polonium
Post-transitionRadioactive; discovered by Marie Curie; intensely radioactive.
Electronic Configuration
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁴
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
18e⁻n=5
6e⁻n=6
Properties
Atomic number
84
Atomic mass
209 u
Category
Post-transition
Block / Group / Period
p · 16 · 6
Valence electrons
6
Oxidation states
+2, +4
Electronegativity
2
Atomic radius
135 pm
Ionization energy
812 kJ/mol
Electron affinity
136 kJ/mol
Melting point
527 K / 254 °C
Boiling point
1235 K / 962 °C
Density
9.32 g/cm³
State at 25 °C
solid
Personal Notes
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