84Po209.000
Post-Transition Metalp-blockRadioactive
Polonium
Element 84 on the periodic table, symbol Po, group 16, period 6.
Polonium is a chemical element with symbol Po and atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie. A rare and highly radioactive element with no stable isotopes, polonium is chemically similar to bismuth and tellurium, and it occurs in uranium ores. Applications of polonium are few.
Appearance: silvery
Properties
- Atomic Number
- 84
- Atomic Mass
- 209.0000 u
- Group
- 16
- Period
- 6
- Block
- p-block
- Category
- Post-Transition Metal
- State at 25 °C
- Solid
- Melting Point
- 527 K · 253.9 °C
- Boiling Point
- 1,235 K · 961.9 °C
- Density
- 9.196 g/cm³
- Atomic Radius
- 190 pm
- Electronegativity
- 2
- Oxidation States
- -2, +2, +4
- Abundance in Crust
- 2.00e-10 mg/kg
- Discovered
- 1898
- Discovered By
- Pierre Curie
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p4
Ionisation Energies (kJ/mol)
- 1. 812.1
Elements near Polonium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.