IrZ =  77

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
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