Copper

29

Cu

63.546(3)

  • Name: Copper
  • Symbol: Cu
  • Atomic number: 29
  • Atomic weight: 63.546(3)
  • CAS Registry ID: 7440-50-8
  • Group name: Coinage metal
  • Period number: 4
  • Block: d-block
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Description

Copper is one of the transition metals that is characterized by its bright “copper” color in its natural solid state. Copper has an atomic weight of 63.546, a melting point of 1984.32 °F, and a boiling point of 4643 °F. Copper is known for having high electrical conductivity properties. Some common uses of copper include: as copper wire for electrical purposes, as a component in metal monetary coins, as a sulphate to purify water, and as a component in water proof roofing material.

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Isolation

Copper is usually found in mineral ores, and isolation procedures are used to obtain pure copper from these minerals.

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Copper sulfides are the minerals that are most often mined for copper isolation and use. These copper sulfides include: chalcopyrite, bornite, covellite, and chalcocite. Additional sources of copper include copper carbonates such as azurite and malachite. The major type of copper ore that is used for isolation purposes is from porphyry copper deposits; these deposits are mined through open pit mining.To isolate copper from these mineral ores, processes are used to form copper sulphides which can be reduced further through copper oxides. The crude copper that is formed from these reduction reactions is further isolated using electrolytic procedures; during the electrolytic process, pure copper cathodes are used.

Copper is one of the metallic elements that occur in nature in its free form, this form of copper is named native copper. Native copper is mined on a small scale and so isolation procedures for copper are not always necessary. However, for large scale copper use isolation procedures are used on copper ore.


General
Name Copper
Symbol Cu
Number 29
Chemical series transition metals
Group 11
Period 4
Block d
Appearance metallic pinkish red
Standard atomic weight 63.546(3) g·mol−1
Electron configuration [Ar] 4s1 3d10
Electrons per shell 2, 8, 18, 1
Atomic properties
Crystal structure face centered cubic 3.6149 Å
Oxidation states 2, 1 (mildly basic oxide)
Electronegativity 1.90 (Pauling scale)
Ionization energies 1st: 745.5 kJ·mol−1
(more) 2nd: 1957.9 kJ·mol−1
(more) 3rd: 3666 kJ·mol−1
Atomic radius 135 pm
Atomic radius (calc.) 145 pm
Covalent radius 138 pm
Van der Waals radius 140 pm
Physical properties
Phase solid
Density (near r.t.) 8.96 g·cm−3
Liquid density at m.p. 8.02 g·cm−3
Melting point 1357.77 K (1084.62 °C, 1984.32 °F)
Boiling point 2835 K (2567 °C, 4643 °F)
Critical point
Heat of fusion 13.26 kJ·mol−1
Heat of vaporization 300.4 kJ·mol−1
Heat capacity (25 °C) 24.440 J·mol−1·K−1
Miscellaneous
Magnetic ordering diamagnetic
Electrical resistivity (20 °C) 16.78 nΩ·m
Thermal conductivity (300 K) 401 W·m−1·K−1
Thermal expansion (25 °C) 16.5 µm·m−1·K−1
Speed of sound (thin rod) (r.t.) (annealed) 3810 m·s−1
Young's modulus 110 - 128 GPa
Shear modulus 48 GPa
Bulk modulus
Poisson ratio
Mohs hardness
Vickers hardness
Brinell hardness
CAS registry number 7440-50-8

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