cupronickel, any of an important group of alloys of copper and nickel; the alloy containing 25 percent nickel is used by many countries for coins. Because copper and nickel mix readily in the molten state, the useful range of alloys is not confined within any definite limits.

What metals make up nickel?

A nickel is a five-cent coin struck by the United States Mint. Composed of 75% copper and 25% nickel, the piece has been issued since 1866. Its diameter is 0.835 inches (21.21 mm) and its thickness is 0.077 inches (1.95 mm).

What is brass made of?

brass, alloy of copper and zinc, of historical and enduring importance because of its hardness and workability. The earliest brass, called calamine brass, dates to Neolithic times; it was probably made by reduction of mixtures of zinc ores and copper ores.