Metal atoms have a relatively unique ability to bond with each other by sharing the electrons in their outer shell (also called valence electrons) with each other. All of the atoms are bonded with each other as their electrons are all part of the same "sea of electrons," so in a sense you could say that a piece of metal is a single gigantic molecule! This special kind of bonding is what gives metals many of their properties, such as the ability to conduct heat and electricity easily. It also is one of the reasons why metals are more malleable than other materials. By ductile, I mean that many metals can be hit with a hammer, and instead of breaking, the metal will bend and deform instead. In the case of gold metal, the metal is so malleable that a 1 ounce gold coin can be hammered thin enough to be spread over a whole football field!