77Ir
Element 77
Iridium
Transition metals
Iridium is a chemical element with symbol Ir and atomic number 77.
Key data
- Atomic number
- 77
- Atomic mass
- 192.217 u
- Group / Period
- 9 / 6
- Block
- d-block
- Phase at STP
- Solid
- Density
- 22.56 g/cm³
- Melting point
- 2445.8 °C
- Boiling point
- 4129.9 °C
- Electron configuration
- [Xe] 4f14 5d7 6s2
Common uses
- •Spark plugs
- •Crucibles
- •Asteroid impact marker
Discovery
Year: 1803
Discovered by: Smithson Tennant
Frequently asked questions
What is the atomic number of Iridium?
Iridium has atomic number 77. Its symbol is Ir and its atomic mass is 192.217 u.
What category of element is Iridium?
Iridium is classified as transition metals. It sits in group 9, period 6 of the periodic table.
What is Iridium used for?
Common uses of Iridium include: Spark plugs, Crucibles, Asteroid impact marker.
When was Iridium discovered?
Iridium was discovered in 1803 by Smithson Tennant.
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