The Element Iridium


Iridium belongs to the platinum family and resembles the same however with a yellow cast added to its usual white surface. Due to its extreme hardness and brittleness, iridium is difficult to machine, form, or work with. However on the positive side, iridium is the most corrosion resistant metal that is known with a little weak point of being prone to attack by molten salts such as sodium chloride.

Industrially iridium is used as crucibles and devices that require high temperatures, in electrical contacts, as a catalyst for carbonylation of methanol to produce acetic acid and used in supercolliders in the production of antimatter, specifically antiprotons.

Atomic Number & Chemical Properties


Element Basics:

Chemical Symbol: Ir
Atomic Number: 77
Atomic Weight: 192.22
Element Classification: Transition Metal
Discovered By: S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils
Date of Discovery: 1804 (England/France)
Origin of Name: Latin: iris (rainbow).

How to Recognize it at a Party:

White, brittle metal

Seriously Atomic Information:

Density (g/cc): 22.42
Melting Point (°K): 2683
Boiling Point (°K): 4403
Atomic Radius (pm): 136
Atomic Volume (cc/mol): 8.54
Covalent Radius (pm): 127
Ionic Radius: 68 (+4e)
Pauling Negativity Number: 2.20
First Ionizing Energy (kJ/mol): 868.1
Oxidation States: 6, 4, 3, 2, 1, 0, -1
Electronic Configuration: [Xe] 4f14 5d7 6s2

Getting Intimate with Iridium:

Lattice Structure: Face-Centered Cubic (FCC)
Lattice Constant (Å): 3.840
Lattice C/A Ratio: n/a
Specific Heat (@20°C J/g mol): 0.133
Fusion Heat (kJ/mol): 27.61
Evaporation Heat (kJ/mol): 604
Thermal Conductivity (@25°C W/m K):
Debye Temperature (°K): 430.00


Society's Questions About Iridium:

Have you ever wondered what everyone else in the world thinks about Iridium? Is anyone else looking for it too? If so, why? What do they want?

The following list shows the most common online questions about the element Iridium. Are your questions the same or different from everyone else's?

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