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Osmium (Os) – Element 76 of the periodic table

Osmium (symbol Os) is element number 76 of the periodic table and belongs to the “Transition metal” category. Its atomic mass is about 190.23, and its phase under standard conditions is Solid. This element sits in period 6 and group 8 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 14, 2. The short electron configuration of Osmium is [Xe] 4f¹⁴ 5d⁶ 6s². Known uses of Osmium include Hard alloys, Pen tips and Surgical instruments.

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Properties of Osmium

Atomic number
76
Chemical symbol
Os
Atomic mass
190.23
Category
Transition metal
Period
6
Group
8
Phase
Solid
Protons
76
Electrons
76
Neutrons (approx.)
114
Electron shells
2, 8, 18, 32, 14, 2
Outer-shell electrons
2
Discovered
Smithson Tennant (1803)

Electron configuration of Osmium

The electron configuration of Osmium (Os), with 76 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 5d⁶ 6s²
Short configuration
[Xe] 4f¹⁴ 5d⁶ 6s²
Last shell
6s²

What is electron configuration and how is it written?

Electron shells of Osmium

Distribution of 76 electrons of Osmium across shells K to P:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O14
  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 Osmium

Frequently asked questions about Osmium

What is the atomic number of Osmium?

The atomic number of Osmium (Os) is 76; that is, every atom of it has 76 protons.

What is the electron configuration of Osmium?

The electron configuration of Osmium (Os) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁶ 6s²; in short form it is [Xe] 4f¹⁴ 5d⁶ 6s², and its last shell is 6s².

What is the chemical symbol of Osmium?

The chemical symbol of Osmium is Os.

Where is Osmium located in the periodic table?

Osmium is located in period 6 and group 8 and belongs to the “Transition metal” category.

What is the atomic mass of Osmium?

The atomic mass of Osmium is about 190.23 (atomic mass units).

What is the phase of Osmium under normal conditions?

The phase of Osmium under standard conditions is Solid.

What are the uses of Osmium?

Uses of Osmium include Hard alloys, Pen tips and Surgical instruments.

Who discovered Osmium?

Osmium was discovered by Smithson Tennant in 1803.

Elements in the same category as Osmium (Transition metal)

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

See all Transition metals

Osmium’s group 8 neighbours

Iron (Fe)Ruthenium (Ru)Hassium (Hs)

Group 8 of the periodic table