the act of competing; rivalry for supremacy, a prize, etc.: The competition between the two teams was bitter. a contest for some prize, honor, or advantage: Both girls entered the competition. the rivalry offered by a competitor: The small merchant gets powerful competition from the chain stores.
A: Copper is an element, because it is composed of only one type of atom. A compound consists of two or more elements that are chemically bound together, and ... Full Answer >
An atom consists of a nucleus made of protons and neutrons in addition to electrons that orbit the nucleus. Since electrons are never in a fixed position, the position of the outermost electron is uncertain, and this makes determining the atomic radius difficult.