Polonium

Symbol 符号

Po 波

Atomic number 原子序数

84

Atomic mass 原子质量	209		Thermal conductivity 热导率	0.20
Atomic radius 原子半径	1.63		Covalent radius 共价半径	1.46
Density 密度	9.4		Atomic volume 原子体积	22.23
Melting point 熔点	527		Oxidation states 氧化态	4,2
Boiling point 沸点	1235		Stable isotopes 稳定同位素	0
Heat of vapor. 汽化热	...		Electronegativity 电负性	2.0
Heat of fusion 熔化热	...		First ionization 第一电离能	8.42
Specific heat 比热容	...		Electrical conduct. 电导率	...

Electron configuration 电子排布

Polonium

Polonium was the first element discovered through its radioacivity, having been discovered in 1898 by Marie Curie during their study of the constituents of the mineral pitchblende. Polonium is chemically similar to bismuth and was found as a fraction of the bismuth sulfide in pitchblende ore. Polonium-210 is the only naturally occuring isotope. It has a half-life of 138 days.

Other isotopes of polonium have been produced by bombardment. Most of them disintegrate by emitting alpha particles, and constitute a good source of pure alpha radiation. Such sources are sometimes used to bombard beryllium, which emits neutrons when bombarded by alpha particles.

In some printing and photography equipment where electrostatic buildup is problem, polonium is used to ionize the air to hinder charge buildup.

Polonium Nuclear Data