Ir	Z =  77	◊ ◊ ◊ ◊ ◊	Iridium
			From the Greek "ptenos", meaning "winged"
(AM) Atomic Mass	192.22  amu	♦	Oxidation States	+3, +4
(BP) Boiling Point	4113  °C	♦	(MP) Melting Point	2410  °C
(ρ) Density	22.42  g/cm3	♦	Crystal Structure	Face Centered Cubic
( χ ) Electronegativity	2.2	♦	(AR) Atomic Radius	1.37  Å
Physical State	Solid	♦	(C) Heat Capacity	0.131  J/g °C
Electronic-Config	[Xe]  4f14  5d7  6s2	♦	(I1) First Ionization E	878.01  kJ/mol
(ΔHvap) Heat of Vaporization	231.8  kJ/mol	♦	(ΔHfus) Heat of Fusion	41.12  kJ/mol
Year of Discovery	1803	♦	Location of Discovery	United Kingdom
(E°) Standard Potential	None
Stable isotopes	191Ir,  193Ir
Discovered/Synthesized by	Smithson Tennant
Natural Source	Found as the uncombined element or in natural alloys
Common Uses	Labware, spark plugs, pen tips, needles
Other Info	Rare in Earth’s crust but not in asteroids Helps support Extinction theory
Previous Element				Next Element
Back to Table				Common Properties
Home Page				Definitions