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Reference


Zinc
Chemical Properties & Compounds



Symbol Atomic Number Atomic Weight Melting Point Boiling Point Phase Density Classification
Zn 30 65.409 419.53 °C 907 °C Solid 7.14 g/cm3 Metal Toxic Element


30 copper ← zinc → gallium
-
↑
Zn
↓
Cd
General
Name, symbol, number zinc, Zn, 30
Chemical series transition metals
Group, period, block 12, 4, d
Appearance bluish pale gray
Standard atomic weight 65.409(4) g·mol−1
Electron configuration [Ar] 3d10 4s2
Electrons per shell 2, 8, 18, 2
Physical properties
Phase solid
Density (near r.t.) 7.14 g·cm−3
Liquid density at m.p. 6.57 g·cm−3
Melting point 692.68 K
(419.53 °C, 787.15 °F)
Boiling point 1180 K
(907 °C, 1665 °F)
Heat of fusion 7.32 kJ·mol−1
Heat of vaporization 123.6 kJ·mol−1
Heat capacity (25 °C) 25.390 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K 610 670 750 852 990 (1185)
Atomic properties
Crystal structure hexagonal
Oxidation states 2
(amphoteric oxide)
Electronegativity 1.65 (Pauling scale)
Ionization energies
(more)		 1st: 906.4 kJ·mol−1
2nd: 1733.3 kJ·mol−1
3rd: 3833 kJ·mol−1
Atomic radius 135 pm
Atomic radius (calc.) 142 pm
Covalent radius 131 pm
Van der Waals radius 139 pm
Miscellaneous
Magnetic ordering diamagnetic
Electrical resistivity (20 °C) 59.0 nΩ·m
Thermal conductivity (300 K) 116 W·m−1·K−1
Thermal expansion (25 °C) 30.2 µm·m−1·K−1
Speed of sound (thin rod) (r.t.) (rolled) 3850 m·s−1
Young's modulus 108 GPa
Shear modulus 43 GPa
Bulk modulus 70 GPa
Poisson ratio 0.25
Mohs hardness 2.5
Brinell hardness 412 MPa
CAS registry number 7440-66-6
Selected isotopes
Main article: Isotopes of zinc
iso NA half-life DM DE (MeV) DP
64Zn 48.6% Zn is stable with 34 neutrons
65Zn syn 244.26 d ε - 65Cu
γ 1.1155 -
66Zn 27.9% Zn is stable with 36 neutrons
67Zn 4.1% Zn is stable with 37 neutrons
68Zn 18.8% Zn is stable with 38 neutrons
69Zn syn 56.4 min β− 0.906 69Ga
70Zn 0.6% Zn is stable with 40 neutrons
References
Zinc Compounds

Source: Wikipedia article Zinc


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Last updated: October 2007

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