30
Zn
Zinc
65.38
Zinc (Zn)
Transition MetalGroup 12Period 4d-block-block
Zinc, in commerce also spelter, is a chemical element with symbol Zn and atomic number 30. It is the first element of group 12 of the periodic table. In some respects zinc is chemically similar to magnesium:its ion is of similar size and its only common oxidation state is +2.
Latin name: Zincum
Atomic Number
30
Atomic Mass
65.38 g/mol
Phase (STP)
Solid
Electron Config.
[Ar] 3d¹⁰ 4s²
General
SymbolZn
Atomic Number30
Atomic Mass65.38 g/mol
CategoryTransition Metal
Group12
Period4
Blockd-block
Electron Configuration[Ar] 3d¹⁰ 4s²
Valence Electrons12
Colourbluish-white metallic
Appearancesilver-gray
CAS NumberCAS7440-66-6
Physical Properties
Phase (STP)Solid
Density7.14 g/cm³
Melting Point419.53°C · 787.15°F · 692.68 K
Boiling Point906.85°C · 1664.33°F · 1180.00 K
Atomic Properties
Atomic Radius142 pm
Electronegativity1.65 Pauling
Ionization Energy906 kJ/mol
Oxidation States+2
Ion ChargeZn2+
Thermodynamic
Molar Heat25.47 J/(mol·K)
Crystal Structure
Crystal Structurehexagonal close-packed
Mechanical Properties
Mohs Hardness2.5
Abundance
In Earth's Crust0.7500%
Discovery & History
Discovered ByAncient
Isotopes of Zinc
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Zn-64 | 48.6% | Stable | — |
| Zn-66 | 27.9% | Stable | — |
| Zn-67 | 4.1% | Stable | — |
| Zn-68 | 18.8% | Stable | — |
| Zn-70 | 0.6% | Stable | — |