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Iridium (Ir) properties


Atomic mass, symbol and atomic number

iridium is a naturally occurring element with the elementary symbol Ir and atomic number 77. In the periodic table it stands with an atomic mass of 192.217 u in the 8th subgroup. The chemical element discovered by Smithson Tennant in 1804 is not radioactive and is in a solid state at room temperature.

Profile: Iridium (English Iridium)

General
Chemical element:iridium
Symbol:Ir
Atomic number:77
Group:cobalt group
Period:6
Block:d-block
Series:Transition metals
Appearance:silver
explorers:Smithson Tennant
Year of discovery:1804
Atomic properties
Atomic mass:192,217 u
Atomic radius:135 pm
Covalent radius:141 pm
Van der Waals radius:unknown
Electron configuration:Xe 4f14 5d7 6s2
ionization:880 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:cubic
Magnetism:paramagnetic
molar volume:8,52 · 10-6 m3/ mol
Mohs hardness:6,5
Melting point:2466 ° C
Boiling point:4130 ° C
Heat of fusion:26 kJ / mol
Heat of vaporization:564 kJ / mol
Thermal conductivity:150W
Chemical properties
electronegativity:2,2

Did you know that ...

  • Iridium belongs to the rarest elements of the periodic table?
  • the Urkilogramm consists of an iridium-platinum alloy?
  • Smithson Tennant, the discoverer of Iridium, also discovered Osmium in parallel?