Iridium

Description:

Symbol: Ir

Atomic number: 77

Atomic weight: 192,217

Element Category: transition metal

Group, period, block: 9, 6, d

Color: silver white / silver-white

Other names: Iridio

Description:

Symbol: Ir

Atomic number: 77

Atomic weight: 192,217

Element Category: transition metal

Group, period, block: 9, 6, d

Color: silver white / silver-white

Other names: Iridio

Physical properties

Melting point: 2466 ° C, 4471 ° F, 2739 K

Boiling point: 4428, 8002, 4701 K

Density: 22.56 g / cm 3

Liquid Density: Melting Point: 19 g / cm 3

Density @ 20øC: 22.56 g / cm 3

Solid density: 22650 kg · m 3

Specific heat: 0.13 (kJ / kg K)

Temperature Superconductivity: 0.11 [-273.04 ° C (-459.47 ° F)] K

Heat of Melting (kJ · mol -1): 26.4

Heat of Vaporization (kJ · mol -1): 612.1

Heat of Atomization (kJ · mol -1): 664.34

Thermal conductivity: 147 W · m -1 · K -1

Thermal expansion: 6.4 μm / (m · K)

Electrical resistivity: (20 ° C) 47.1 n · m

Molar heat capacity: 25.10 J · mol -1 · K -1

Young's modulus: 528 GPa

Shear modulus: GPa 210

Bulk module: 320 GPa

Poisson ratio: 0.26

Hardness of Mohs: 6.5

Vickers Hardness: 1760 MPa

Brinell hardness: 1670 MPa

Sound velocity: (20 ° C) 4825 m · s -1

Pauling's electronegativity: 2.2

Allred Rochow Electronegativity: 1.55

Pauling Electropositivity: 1.8

Reflectivity (%): 78

Chemical properties

Electrons: 77

Protons: 77

Neutron: 115

Electronic configuration: [Xe] 4f 14 5d 7 6s 2

Atomic radius: 136 pm

Atomic radius, unbound (Å): 2.13

Covalent Ray: 141 ± 18:00

Covalent Radius (Å): 1.32

Van der Waals radius: 202 pm

Oxidation states: 3.1, 0.1, 2, 3, 4, 5, 6

Solid state

Crystal structure: centered on the cubic face

Magnetic ordering: paramagnetic

Electronic affinity (kJ · mol -1) 111,537

1st ionization energy: 880 kJ · mol -1

2nd ionization energy: 1600 kJ · mol -1

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