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

How many protons does osmium have?

Osmium has 76 protons. Its atomic number is 76, which is also the number of electrons in a neutral atom of osmium.

What group and period is osmium in?

Osmium is in group 8 and period 6 of the periodic table, in the d-block.

What is the atomic mass of osmium?

The atomic mass of osmium is 190.23 u (unified atomic mass units).

Element 76

Osmium (Os)

Transition metal · Period 6 · Group 8 · d-block

Osmium (Os) is element 76 of the periodic table, a transition metal in period 6, group 8 (d-block) with an atomic mass of 190.23 and is a solid at standard conditions.

At a glance

Atomic number: 76
Symbol: Os
Atomic mass: 190.23 u
Category: Transition metals
Period: 6
Group: 8
Block: d-block
Phase at STP: solid

Electron structure

Electron configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d6 6s2
Shorthand configuration: [Xe] 4f14 5d6 6s2
Electrons per shell: 2, 8, 18, 32, 14, 2
Oxidation states: -4, -2, -1, +1, +2, +3, +4, +5, +6, +7, +8

Physical properties

Melting point: 3,306 K (3,032.85 °C)
Boiling point: 5,285 K (5,011.85 °C)
Density: 22.59 g/cm³
Phase: solid

Atomic properties

Electronegativity (Pauling): 2.2
Atomic radius: 185 pm
Covalent radius: 144 pm
First ionization energy: 840 kJ/mol
Electron affinity: 104 kJ/mol

Notable isotopes

Notable isotopes of Osmium: mass number, atomic mass, natural abundance, and stability.
Isotope	Mass	Abundance	Stability
Os-192	191.96148	40.78%	Stable

Common uses

Fountain pen tips
Electrical contacts
Fingerprint detection
Alloys

Discovery

Year: 1803
Discovered by: Smithson Tennant
Country: England

Frequently asked questions

Is osmium a metal?: Yes. Osmium is a metal, classified as a transition metal on the periodic table.
How many protons does osmium have?: Osmium has 76 protons. Its atomic number is 76, which is also the number of electrons in a neutral atom of osmium.
What group and period is osmium in?: Osmium is in group 8 and period 6 of the periodic table, in the d-block.
What is the atomic mass of osmium?: The atomic mass of osmium is 190.23 u (unified atomic mass units).

Keep exploring

Osmium'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.