76 2 · 8 · 18 · 32 · 14 · 2

Osmium, Os, element 76

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

Configuration [Xe]4f¹⁴5d⁶6s²

Atomic weight: 190.23Da
Phase: solid
Density: 22.5872g/cm³
Melting point: 3,306.15K 3,033 °C
Boiling point: 5,281.15K 5,008 °C
Electronegativity: 2.2

Hard blue-white metallic transition element. Found with platinum and used in some alloys with platinum and iridium. Description from mendeleev.

Back to the table

The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

5 of 5 fields have a value for osmium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.: 190.23Da; Source: mendeleev
Electron configuration: [Xe]4f¹⁴5d⁶6s²; Source: mendeleev
Uncertainty of the atomic weight: 0.03Da; Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d⁶6s²; Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.: 2 · 8 · 18 · 32 · 14 · 2; Source: Worked outfrom electron configuration

Screening of each subshell

Clementi's screening constants: how much of the nucleus's charge the other electrons hide from an electron in each subshell. What is left is the effective nuclear charge it feels.

Subshell	Screening σ	Effective charge Z − σ
1s	1.4701	74.5299
2s	19.8502	56.1498
2p	4.4502	71.5498
3s	22.5727	53.4273
3p	21.7483	54.2517
3d	13.5253	62.4747
4s	33.9048	42.0952
4p	34.856	41.144
4d	37.142	38.858
4f	38.8472	37.1528
5s	50.905	25.095
5p	53.09	22.91
5d	58.003	17.997
6s	65.677	10.323