A bright silver-white metallic element of atomic number 28. It is of the iron group, and is hard, malleable, and ductile. It occurs combined with sulphur in millerite, with arsenic in the mineral niccolite, and with arsenic and sulphur in nickel glance. Symbol Ni. Atomic weight 58.70.
This metal offers combination of corrosion resistance, formability and tough physical properties. For these reasons, nickel is used for alloying purposes and in nickel-clad copper wire.