45Rh102.905

Rhodium

Transition metalsBlock dPeriod 5Group 9solid at 20 °C
Configuration :
[Kr] 4d⁸ 5s¹
Atomic mass :
102.90549 u
3D Bohr-model representation of the Rhodium atom (symbol Rh, atomic number Z=45). Electron shell configuration: 2, 8, 18, 16, 1 electrons.
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Bohr model · educational

Bohr model of rhodium

Bohr model of rhodium (Rh): 45 electrons in 5 shells — 2, 8, 18, 16, 1

Rhodium (Rh) has 45 electrons, spread over 5 shells. The diagram places them on circles around the nucleus, from the K shell — the closest — outward.

ShellElectrons
K (n = 1)2
L (n = 2)8
M (n = 3)18
N (n = 4)16
O (n = 5)1

The Bohr model is a teaching picture: electrons do not travel in circular orbits, but the number of electrons per shell is exact.

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Homogeneous catalysis

Catalysts in solution, transition-metal complexes, Wilkinson's hydrogenation.

13 min
Start

Electron configuration

Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁸ 5s¹
Short[Kr] 4d⁸ 5s¹
Valence electrons9
KLMNOPQ shells
K2
L8
M18
N16
O1

Electronegativity

Pauling2.28
Allen1.56
Mulliken (eV)—

Atomic radii

Empirical135 pm
Calculated173 pm
Covalent142 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+366.5 pm

Successive ionisation energies

I₁719.7 kJ/mol
I₂1740 kJ/mol
I₃2997 kJ/mol
Electron affinity109.7 kJ/mol

Oxidation states

-3-10+1+2+3+4+5+6
Bold states = most common.
Warm-up

Rhodium — do you remember?

3 questions on this page. The right answer shows every time, and nothing is asked of you to play.

No account · one minute

Period 5Block dIUPAC Group 9Family Transition metals
Sources : NIST Atomic Weights & Isotopic Compositions, IUPAC Recommendations, CODATA. Methodology