Iridium (Ir) » Innovachem

Isotope	Z(p)	N(n)	Atomic Mass	Natural Abundance	Enrichment Level	Chemical Form
Ir-191	77	114	190.960591	37.30%	>93.00%	Metal
Ir-193	77	116	192.962923	62.70%	98.40%	Metal

Name	Iridium
Symbol	Ir
Atomic number	77
Atomic weight	192.22
Standard state	Solid at 298 ºK
CAS Registry ID	7439-88-5
Group in periodic table	9
Group name	Precious metal or platinum group metal
Period in periodic table	6
Block in periodic table	d-block
Color	Silvery white
Classification	Metallic
Melting point	2410 °C
Boiling point	4130 °C
Vaporization point	4130 °C
Thermal conductivity	147 W/(m·K) at 298.2 °K
Electrical resistivity	5.3 µΩ·cm at 20 °C
Electronegativity	2.2
Specific heat	0.133 kJ·mol^-1 at 20 °C
Heat of vaporization	560 kJ·mol^-1 at 4130 °C
Heat of fusion	26 kJ·mol^-1
Density of liquid	19 g/cm³ at 2410 °C
Density of solid	22.42 g/cm³ (highest among metals)
Mohs hardness scale	6.0-6.5
Electron configuration	[Xe]4f¹⁴5d⁷6s²
Oxidation states	0, +1, +2, +3, +4, +5, +6
Common oxidation states	+3, +4