Selenium

Symbol 符号

Se

Atomic number 原子序数

34

Atomic mass 原子质量	78.96		Thermal conductivity 热导率	0.0204
Atomic radius 原子半径	1.22		Covalent radius 共价半径	1.16
Density 密度	4.80		Atomic volume 原子体积	16.45
Melting point 熔点	490		Oxidation states 氧化态	-2,4,6
Boiling point 沸点	958		Stable isotopes 稳定同位素	5
Heat of vapor. 汽化热	37.7		Electronegativity 电负性	2.55
Heat of fusion 熔化热	6.694		First ionization 第一电离能	9.752
Specific heat 比热容	0.32		Electrical conduct. 电导率	...

Electron configuration 电子排布

Selenium

Selenium occurs as a gray material and as a red allotropic material. The gray material has a small electrical conductivity in the dark which increases dramatically with exposure to light. This property is used in "selenium cells" for light sensors for control applications.

Selenium is used to impart a ruby-red color to glass and to neutralize the green color in glass which is present due to iron content.

Selenium is similar to sulfur in its chemical properties. One mineral form of selenium is the compound with lead, clausthalite, PbSe.

Selenium Nuclear Data