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Iridium (Ir)

Iridium (Ir) is element 77 of the periodic table, a transition metal in period 6 and group 9. Its standard atomic weight is 192.217, so one mole of iridium atoms has a mass of 192.217 g. At room temperature it is a solid; it melts at 2445.85 °C and boils at 4427.85 °C.

77 Ir Iridium 192.217

Period 6, group 9 · Transition metal

← Os Osmium Pt Platinum →

Atomic number	77
Symbol	Ir
Standard atomic weight	192.217
Molar mass	192.217 g/mol
Category	Transition metal
Group	9
Period	6
Block	d-block
Electron configuration	[Xe] 6s² 4f¹⁴ 5d⁷
Oxidation states	+4, +3
Electronegativity (Pauling)	2.2
Atomic radius (van der Waals)	202 pm
First ionisation energy	9.1 eV (878 kJ/mol)
Electron affinity	1.565 eV
State at room temperature	Solid
Melting point	2719 K (2445.85 °C)
Boiling point	4701 K (4427.85 °C)
Density	22.42 g/cm³
Discovered	1803

Group 9

Co · Cobalt Rh · Rhodium Mt · Meitnerium

Calculate with Iridium

Molar mass of Ir Balance an equation Grams, moles and particles Whole periodic table

Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.