Copper

Transition metal · 63.55 u · group 11, period 4

Copper · Cu

Atomic number29

SymbolCu

CategoryTransition metal

Standard stateSolid

Group · Period · Block11 · 4 · d

Electron configuration[Ar]4s1 3d10

Atomic mass63.55 u

Atomic radius140 pm

Protons / Neutrons / Electrons29 / 35 / 29

Shells (e⁻ per shell)2, 8, 18, 1

Electronegativity (Pauling)1.9

Ionization energy7.726 eV

Electron affinity1.228 eV

Oxidation states+2, +1

Melting point1.36e+3 K · 1.08e+3 °C

Boiling point2.84e+3 K · 2.56e+3 °C

Density8.933 g/cm³

Year discoveredAncient

CPK color

#C88033

State at room temp (25 °C)

solid

Position