Recognised as Chemical element
Polonium
- Po
- Z = 84
- post-transition metal
- No stable isotope
Polonium (Po) is element 84, a post-transition metal in period 6 and group 16. Its most stable isotope has mass number 209. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolPo
Mass number of the most stable isotope209this element has no stable isotope
Mass in kilograms3.4705266 × 10^-25
Categorypost-transition metal
Group16
Period6
Blockp-block
Electrons in a neutral atom84
Neutrons in the most common isotope125≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁴ground state, subshells written in order of n
Noble gas shorthand[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴
Electrons per shell2, 8, 18, 32, 18, 6K, L, M and outward
Electrons in the outer shell6
Unpaired electrons2Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass209 g/mol
Mass of one mole209 grams
Atoms in one gram2.8814071 × 10^21
Mass of one atom3.4705267 × 10^-22 g
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