Technical data for Zinc

Overview
NameZinc
SymbolZn
Atomic Number30
Atomic Weight65.409
Density7.14 g/cm3
Melting Point419.53 °C
Boiling Point907 °C

Thermal properties
PhaseSolid
Melting Point419.53 °C
Boiling Point907 °C
Absolute Melting Point692.68 K
Absolute Boiling Point1180 K
Heat of Fusion7.35 kJ/mol
Heat of Vaporization119 kJ/mol
Heat of CombustionN/A
Specific Heat388 J/(kg K)[note]
Thermal Conductivity120 W/(m K)
Thermal Expansion0.0000302 K-1

Bulk physical properties
Density7.14 g/cm3
Density (Liquid)6.57 g/cm3
Molar Volume9.161×10-6
Brinell Hardness412 MPa
Mohs Hardness2.5 MPa
Bulk Modulus70 GPa
Shear Modulus43 GPa
Young Modulus108 GPa
Poisson Ratio0.25
Refractive Index1.00205
Speed of Sound3.7×103 m/s
Thermal Conductivity120 W/(m K)
Thermal Expansion0.0000302 K-1

Reactivity
Valence2
Electronegativity1.65
ElectronAffinity0 kJ/mol
Ionization Energies
906.4, 1733.3, 3833, 5731, 7970, 1.04×104, 1.29×104, 1.68×104, 1.96×104, 2.3×104, 2.64×104, 29990, 40490, 4.38×104, 4.73×104, 5.23×104, 5.59×104, 5.97×104, 6.73×104, 7.12×104, 1.791×105 kJ/mol

Health and Safety
Autoignition Point460 °C
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockd
Group12
Period4
Electron Configuration[Ar]3d104s2
ColorSlateGray
Discovery
1500 in Germany
Gas phaseN/A
CAS NumberCAS7440-66-6

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.7×107 S/m
Resistivity5.9×10-8 m Ω
Superconducting Point0.85

Magnetic properties
Magnetic TypeDiamagnetic
Curie PointN/A
Mass Magnetic Susceptibility-2.21×10-9
Molar Magnetic Susceptibility-1.45×10-10
Volume Magnetic Susceptibility-0.0000158

Abundances
% in Universe0.00003%
% in Sun0.0002%
% in Meteorites0.018%
% in Earth's Crust0.0078%
% in Oceans5×10-7%
% in Humans0.0033%

Atomic dimensions and structure
Atomic Radius142 pm
Covalent Radius131 pm
Van der Waals Radius139 pm
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
266.49, 266.49, 494.68 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
64Zn, 66Zn, 67Zn, 68Zn, 70Zn
Isotopic Abundances
64Zn48.63%
66Zn27.9%
67Zn4.1%
68Zn18.75%
70Zn0.62%

Notes on the properties of Zinc:
Specific Heat: Value given for solid phase.