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Periodic table / Transition metals

45Rhodium

Rhodium is a transition metal in group 9, period 5. At 25 °C it is a solid.

Rh
Shells: 2, 8, 18, 16, 1. A simple picture: electrons do not move in circles.
Symbol
Rh
Atomic number
45 protons in the nucleus
Standard atomic weight
102.91 ± 0.01
Electron configuration
[Kr] 4d8 5s1
Electrons in each shell
2, 8, 18, 16, 1
Group, period, block
9, 5, d
Family
Transition metals
State at 25 °C
solid
Electronegativity
2.28 (Pauling scale)
First ionisation energy
719.7 kJ/mol (7.4589 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.