Rhodium

Element 45 on the periodic table, symbol Rh, group 9, period 5.

Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, and chemically inert transition metal. It is a member of the platinum group.

Appearance: silvery white metallic

Properties

Atomic Number: 45
Atomic Mass: 102.9055 u
Group: 9
Period: 5
Block: d-block
Category: Transition Metal
State at 25 °C: Solid
Melting Point: 2,237 K · 1,963.9 °C
Boiling Point: 3,968 K · 3,694.9 °C
Density: 12.41 g/cm³
Atomic Radius: 135 pm
Electronegativity: 2.28
Oxidation States: +3
Abundance in Crust: 0.001 mg/kg
Discovered: 1803
Discovered By: William Hyde Wollaston

Electron Configuration

[Kr] 4d8 5s1

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d8

Ionisation Energies (kJ/mol)

1. 719.7
2. 1,740
3. 2,997

Elements near Rhodium

Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.