Polonium

Atomic number

84

Atomic mass (u)

208.98243

Category

Metalloid

Standard state

Solid

Melting point

253.85 °C (527 K)

Boiling point

961.85 °C (1235 K)

Density (g/cm³)

9.32

Electronegativity (Pauling)

2

Electron configuration

[Xe]6s2 4f14 5d10 6p4

Oxidation states

+4, +2

Atomic radius (pm)

197

First ionization energy (eV)

8.417

Discovery & recognition

Discovery year / period (PubChem)

1898

Discovery credited to (RSC)

Marie Curie

Date or period recorded by RSC

1898

Discovery place

Not supplied in the structured record; see the RSC history source.

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Polonium is a very rare natural element.”

Royal Society of Chemistry · occurrence excerpt ↗

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Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.