Iridium

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 77
Element Iridium
Symbol Ir
Atomic Mass 192.217 u
Number of Neutrons 115 (most common isotope, Iridium-193)
Number of Protons 77
Number of Electrons 77
Period 6
Group 9
Phase Solid
Radioactive No
Natural Yes
Metal Yes
Nonmetal No
Metalloid No
Type Transition Metal
Atomic Radius 180 pm
Electronegativity 2.20 (Pauling scale)
First Ionization Energy 8.967 eV
Density 22.56 g/cm³
Melting Point 2446 °C
Boiling Point 4428 °C
Number of Isotopes 2 stable (Iridium-191, Iridium-193)
Discoverer Smithson Tennant
Year 1803
Specific Heat 0.131 J/g·K
Number of Shells 6
Number of Valence Electrons 9
Tags: Tutorials Chemistry tutorial step by step learn how to guide examples
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