Discovered By: Smithson Tennant
Discovery year: 1803

The following table showing some properties of Iridium(Ir):

Table Example
Atomic number 77
Group 9
Period 6
Block d
Electrons 77
Protons 77
Neutrons 115
Atomic weight 192.217
Oxidation states -1, +1, +2, +3, +4, +6
Ionic charge Ir^4+


Table Example
Electrons per shell K2 L8 M18 N32 O15 P2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^7
Atomic radius 180 pm
Covalent radius 141 pm
Boiling point 4428°C
Melting point 2466°C
Phase Solid
Fusion heat 26 kJ.mol^-1
Vaporization heat 560 kJ.mol^-1
Color Silver


Table Example
Brinell hardness 1670 MPa
Bulk modulus 320 GPa
Density 22560 kg.m^-3
Liquid density 19000 kg.m^-3
Mohs hardness 6.5
Poisson ratio 0.26
Shear modulus 210 GPa
Sound speed 4825 m.s^-1
Vickers hardness 1760 MPa
Young's modulus 528 GPa


Table Example
Electrical type Conductor
Magnetic type Paramagnetic
Resistivity 4.7*10^-8 Ohm.m
Superconducting point 0.11 K
Eectronegativity 2.2
Valence 6
Electron affinity 151 kJ.mol^-1
First ionization energy 880 kJ.mol^-1
Radioactive No
Neutron cross section 425 barn