Polonium (Po)

From Wikipedia, the free encyclopediaPolonium 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.

Polonium in the periodic table

SymbolPo
Atomic number84
Group16
Period6
Blockp
Element categoryPost-Transition Metal

Physical properties

Phase at STPSolid
Density9.196 g/cm3
Atomic weight209 u
Melting point527 K
253.85 °C
488.93 °F
Boiling point1235 K
961.85 °C
1763.33 °F

Atomära egenskaper

Electronegativity (Pauling Scale)2
Electron affinity136 kJ/mol
Ionization energies
1812.1 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p4
Electrons per shell2, 8, 18, 32, 18, 6

History

Discovered1898
Discovered byPierre Curie
Marie Curie