Cadmium was discovered by German chemist Friedrich Stromeyer (1776-1835) in 1817 in Germany, as an impurity in zinc carbonate.
Name: Cadmium
Symbol: Cd
Atomic number: 48
Atomic weight: 112.41
State: solid
Group, period, block: 12, 5, d
Color: silvery bluish-gray metallic
Classification: transition metal
Electron configuration: 4d10 5s2
2,8,18,18,2
Physical properties
Density: 8.65 g/cm-3
Melting point: 594.22 K, 321.07 °C, 609.93 °F
Boiling point: 1040 K, 767 °C, 1413 °F
Atomic properties
Oxidation states: 2, 1
Electronegativity: 1.69 (Pauling scale)
Ionization energies: 1st: 867.8 kJ·mol-1
Covalent radius: 144±9 pm
Van der Waals radius: 158 pm
- Cd
Electron Configuration
Isotopes
There are eight naturally occurring isotopes of cadmium exist, 106Cd, 108Cd, 110Cd, 111Cd, 112Cd, 113Cd, 114Cd, and 116Cd.