Chemical element · Atomic number 84
Polonium
Polonium in the periodic table: atomic number 84, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Metalloid
solid
[208.98243] u
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Atomic classification
Shell occupancy
Polonium in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 32 electrons
- O · n=5
- 18 electrons
- P · n=6
- 6 electrons
- Electron configuration
- [Xe]6s2 4f14 5d10 6p4
- Electrons per shell
- 2 · 8 · 18 · 32 · 18 · 6
- Group
- 16
- Period
- 6
- Block
- P
- Element category
- Metalloid
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Physical and chemical properties
- Atomic mass
- [208.98243] u
- Standard state
- solid
- Density
- 9.32 g/cm³
- Melting point
- 527 K
- Boiling point
- 1,235 K
- Electronegativity
- 2 (Pauling)
- First ionisation energy
- 8.417 eV
- Oxidation states
- +4, +2
- Discovery
- 1898
Safety and periodic classification
Safety
Safe handling cannot be inferred from Polonium's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Polonium is in period 6, group 16 and the P block. Its direct neighbours by atomic number are Bismuth and Astatine. The recorded Pauling electronegativity is 2. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.