Chemical – Iridium (Ir)


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Iridium at Chemical
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Basic Information

Name: Iridium
Symbol: Ir
Atomic Number: 77
Atomic Mass: 192.217 amu
Melting Point: 2410.0 °C (2683.15 K, 4370.0 °F)
Boiling Point: 4527.0 °C (4800.15 K, 8180.6 °F)
Number of Protons/Electrons: 77
Number of Neutrons: 115
Classification: Transition Metal
Crystal Structure: Cubic
Density @ 293 K: 22.5 g/cm3
Color: white

Atomic Structure

[Bohr Model of Iridium]   Number of Energy Levels: 6

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 15
    Sixth Energy Level: 2


Isotope Half Life
Ir-188 1.7 days
Ir-189 13.2 days
Ir-190 11.8 days
Ir-190m 1.2 hours
Ir-190m2 3.2 hours
Ir-191 Stable
Ir-192 73.8 days
Ir-193 Stable
Ir-193m 10.5 days
Ir-194 19.3 hours
Ir-194m 170.0 days


Date of Discovery: 1804
Discoverer: S. Tenant
Name Origin: From the Latin word iridis (rainbow)
Uses: tip gold pens, crucible and special containers
Obtained From: gravel deposits with platinum

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