Yes. Iridium is a metal, classified as a transition metal on the periodic table.

How many protons does iridium have?

Iridium has 77 protons. Its atomic number is 77, which is also the number of electrons in a neutral atom of iridium.

What group and period is iridium in?

Iridium is in group 9 and period 6 of the periodic table, in the d-block.

What is the atomic mass of iridium?

The atomic mass of iridium is 192.22 u (unified atomic mass units).

Element 77

Iridium (Ir)

Transition metal · Period 6 · Group 9 · d-block

Iridium (Ir) is element 77 of the periodic table, a transition metal in period 6, group 9 (d-block) with an atomic mass of 192.22 and is a solid at standard conditions.

At a glance

Atomic number: 77
Symbol: Ir
Atomic mass: 192.22 u
Category: Transition metals
Period: 6
Group: 9
Block: d-block
Phase at STP: solid

Electron structure

Electron configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d7 6s2
Shorthand configuration: [Xe] 4f14 5d7 6s2
Electrons per shell: 2, 8, 18, 32, 15, 2
Oxidation states: -3, -1, +1, +2, +3, +4, +5, +6, +7, +8, +9

Physical properties

Melting point: 2,719 K (2,445.85 °C)
Boiling point: 4,701 K (4,427.85 °C)
Density: 22.56 g/cm³
Phase: solid

Atomic properties

Electronegativity (Pauling): 2.2
Atomic radius: 180 pm
Covalent radius: 141 pm
First ionization energy: 880 kJ/mol
Electron affinity: 151 kJ/mol

Notable isotopes

Notable isotopes of Iridium: mass number, atomic mass, natural abundance, and stability.
Isotope	Mass	Abundance	Stability
Ir-193	192.96292	62.7%	Stable

Common uses

Spark plugs
Crucibles
Electrical contacts
Cancer treatment

Discovery

Year: 1803
Discovered by: Smithson Tennant
Country: England

Frequently asked questions

Is iridium a metal?: Yes. Iridium is a metal, classified as a transition metal on the periodic table.
How many protons does iridium have?: Iridium has 77 protons. Its atomic number is 77, which is also the number of electrons in a neutral atom of iridium.
What group and period is iridium in?: Iridium is in group 9 and period 6 of the periodic table, in the d-block.
What is the atomic mass of iridium?: The atomic mass of iridium is 192.22 u (unified atomic mass units).

Keep exploring

Iridium's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.