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 >
1.9: Understand that atoms consist of a central nucleus, composed of protons and neutrons, surrounded by electrons, orbiting in shells. The nucleus of the atom contains protons and neutrons. The nucleus is orbited by a number of electrons in a number of shells. The following diagram has only one shell of electrons: