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Iridium (Ir) – Element 77 of the periodic table

Iridium (symbol Ir) is element number 77 of the periodic table and belongs to the “Transition metal” category. Its atomic mass is about 192.22, and its phase under standard conditions is Solid. This element sits in period 6 and group 9 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 15, 2. The short electron configuration of Iridium is [Xe] 4f¹⁴ 5d⁷ 6s². Known uses of Iridium include Spark plug electrodes, High-temperature containers and Precision clocks.

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Properties of Iridium

Atomic number
77
Chemical symbol
Ir
Atomic mass
192.22
Category
Transition metal
Period
6
Group
9
Phase
Solid
Protons
77
Electrons
77
Neutrons (approx.)
115
Electron shells
2, 8, 18, 32, 15, 2
Outer-shell electrons
2
Discovered
Smithson Tennant (1803)

Electron configuration of Iridium

The electron configuration of Iridium (Ir), with 77 electrons, is shown below. The last shell (shell 6) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁷ 6s²
Short configuration
[Xe] 4f¹⁴ 5d⁷ 6s²
Last shell
6s²

What is electron configuration and how is it written?

Electron shells of Iridium

Distribution of 77 electrons of Iridium across shells K to P:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O15
  6. P2

What is a transition metal?

The transition metals are the d-block elements: usually good conductors of heat and electricity, with several oxidation states, and they form colourful compounds and important catalysts.

Uses of Iridium

Frequently asked questions about Iridium

What is the atomic number of Iridium?

The atomic number of Iridium (Ir) is 77; that is, every atom of it has 77 protons.

What is the electron configuration of Iridium?

The electron configuration of Iridium (Ir) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁷ 6s²; in short form it is [Xe] 4f¹⁴ 5d⁷ 6s², and its last shell is 6s².

What is the chemical symbol of Iridium?

The chemical symbol of Iridium is Ir.

Where is Iridium located in the periodic table?

Iridium is located in period 6 and group 9 and belongs to the “Transition metal” category.

What is the atomic mass of Iridium?

The atomic mass of Iridium is about 192.22 (atomic mass units).

What is the phase of Iridium under normal conditions?

The phase of Iridium under standard conditions is Solid.

What are the uses of Iridium?

Uses of Iridium include Spark plug electrodes, High-temperature containers and Precision clocks.

Who discovered Iridium?

Iridium was discovered by Smithson Tennant in 1803.

Elements in the same category as Iridium (Transition metal)

Ruthenium (Ru)Rhodium (Rh)Palladium (Pd)Silver (Ag)Cadmium (Cd)Hafnium (Hf)Tantalum (Ta)Tungsten (W)Rhenium (Re)Osmium (Os)Platinum (Pt)Gold (Au)Mercury (Hg)Rutherfordium (Rf)Dubnium (Db)Seaborgium (Sg)Bohrium (Bh)Hassium (Hs)Meitnerium (Mt)Darmstadtium (Ds)

See all Transition metals

Iridium’s group 9 neighbours

Cobalt (Co)Rhodium (Rh)Meitnerium (Mt)

Group 9 of the periodic table