Iridium

Iridium, Ir, is a silvery transition metal element, found in Group VIII of the periodic table.

Atomic Number : 77
Relative Atomic Mass : 192
Melting Point : 2410 degC
Boiling Point : 4130 degC
Relative Density : 22

Discovery

Iridium was discovered by Tennant in 1804AD.

Properties

Iridium is a hard brittle metal which is difficult to machine and work.

Iridium is a member of the platinum group and is highly resistant to corrosion.

Uses

Iridium is used

in the alloy of the standard meter bar in Paris,
for crucibles in gravimetric analysis,
in electrical contacts, and
in alloy with platinum to harden it.

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