48Cd112.414
Transition Metald-block
Cadmium
Element 48 on the periodic table, symbol Cd, group 12, period 5.
Cadmium is a chemical element with symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Like zinc, it prefers oxidation state +2 in most of its compounds and like mercury it shows a low melting point compared to transition metals.
Appearance: silvery bluish-gray metallic
Properties
- Atomic Number
- 48
- Atomic Mass
- 112.4144 u
- Group
- 12
- Period
- 5
- Block
- d-block
- Category
- Transition Metal
- State at 25 °C
- Solid
- Melting Point
- 594.2 K · 321.1 °C
- Boiling Point
- 1,040 K · 766.9 °C
- Density
- 8.65 g/cm³
- Atomic Radius
- 155 pm
- Electronegativity
- 1.69
- Oxidation States
- +2
- Abundance in Crust
- 0.15 mg/kg
- Discovered
- 1817
- Discovered By
- Karl Samuel Leberecht Hermann
Electron Configuration
[Kr] 4d10 5s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10
Ionisation Energies (kJ/mol)
- 1. 867.8
- 2. 1,631.4
- 3. 3,616
Elements near Cadmium
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.