as chlorine atoms (green), because the formula is NaCl. A mixture is formed when two or more elements or compounds are present without being chemically bonded together. The substances which have ...

A group of international researchers has discovered a previously unknown chemical compound in U.S. drinking water — and it could be toxic. The compound — known as chloronitramide anion — is ...

A compound contains atoms of different elements, chemically joined together. Compounds form in chemical reactions, and you need other chemical reactions to separate a compound into its elements.