84 · Po
Polonium
Announced by Pierre and Marie Curie in July 1898.
Identity
- Atomic number
- 84
- Symbol
- Po
- Canonical name
- Polonium
- Category
- post-transition metal
- Group
- 16
- Period
- 6
- Block
- p
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- [209] No standard atomic weight. The number shown is the conventional mass number used in tables, not a measured mass in u.
- Electron configuration
- [Xe] 4f14 5d10 6s2 6p4
- Electrons per shell
- 2, 8, 18, 32, 18, 6
- Standard state
- solid
- Density
- 9.196 g/cm³
- Melting point
- 527 K
- Boiling point
- 1,235 K
- Electronegativity
- 2 Pauling
- First ionization energy
- 812.1 kJ/mol
- Electron affinity
- 136 kJ/mol
Notable isotopes
This summary is not an inventory of every isotope.
Conventional mass number: 209
History
Polonium in pitchblende
Discovery · jointly credited · 1898
The Curies announce polonium in July 1898, before the radium of December.
Etymology
- Theme
- country
- Language
- latin
- Root
- Polonia
- Meaning
- Poland
Scientists
Places and institutions
- Paris — historical setting : France — present country : France
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- Pierre et Marie Curie, notes aux Comptes rendus de l’Académie des sciences, 1898
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements