Iridium

Symbol 符号

Ir

Atomic number 原子序数

77

Atomic mass 原子质量	192.22		Thermal conductivity 热导率	1.47
Atomic radius 原子半径	1.87		Covalent radius 共价半径	1.27
Density 密度	22.4		Atomic volume 原子体积	8.54
Melting point 熔点	2680		Oxidation states 氧化态	2,3,4,6
Boiling point 沸点	4400		Stable isotopes 稳定同位素	2
Heat of vapor. 汽化热	604		Electronegativity 电负性	2.2
Heat of fusion 熔化热	26.1		First ionization 第一电离能	9.1
Specific heat 比热容	0.130		Electrical conduct. 电导率	...

Electron configuration 电子排布

Iridium

Iridium is a metal of the platinum group. It is very unreactive and is sometimes alloyed with platinum to form a very hard alloy. Platinum-iridium is used for the tips of gold pens, and for surgical tools.

Iridium was brought into public discussion with the discovery of an iridium-rich layer in the strata of soil and rock which covers the entire planet. It is part of the evidence for an asteroid collision with the earth, widely associated with the extinction of the dinosaurs about 65 million years ago.

Iridium Nuclear Data