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Periodic table / Transition metals

76Osmium

Osmium is a transition metal in group 8, period 6. At 25 °C it is a solid.

Os
Shells: 2, 8, 18, 32, 14, 2. A simple picture: electrons do not move in circles.
Symbol
Os
Atomic number
76 protons in the nucleus
Standard atomic weight
190.23 ± 0.03Some geological samples have an unusual isotope mix, so their atomic weight can fall outside this range.
Electron configuration
[Xe] 4f14 5d6 6s2
Electrons in each shell
2, 8, 18, 32, 14, 2
Group, period, block
8, 6, d
Family
Transition metals
State at 25 °C
solid
Electronegativity
2.2 (Pauling scale)
First ionisation energy
814.2 kJ/mol (8.43823 eV)
Where these numbers come from

Atomic weight: IUPAC CIAAW, abridged standard atomic weights 2024. Electron configuration and ionisation energy: NIST Atomic Spectra Database. Family, state and electronegativity: PubChem. See Sources. Melting points, boiling points and densities are left out for now: published values differ between sources, and we will add them once each has been checked.