What is made up of metal?

The metals in your home, as well as every other thing in the world, are all made of atoms. An atom is the smallest piece of something you can have. In the case of metals, there are dozens of different kinds of atoms, called "elements", and each atom of any element is identical to any other atom of that element. read more

Anything that can’t be made out of plastic or ceramic because they aren’t sufficiently strong, heat-resistant, tough, or dense for the application. Anything that has to be strongly magnetic or carry electric current. read more

A star fuses lighter atoms, mostly hydrogen and helium, to make heavier atoms over its lifetime. Used in that sense, the metallicity of an astronomical object is the proportion of its matter made up of the heavier chemical elements. read more