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• Every element has its own chemical symbol.

• The symbol for an element is one of the most important pieces of information presented in the periodic table.

• A chemical symbol is a letter or group of letters representing an element in a chemical formula.

Naming chemical compounds:

• Chemical compounds consist of elements bonded together.

Simple and compound ions:

• Compound ion: An ion made up of several different atoms covalently bonded together and with an overall charge.

Rules for naming compounds:

• If there is a metal in the compound, it is named first.

• Where the metal can form more than one ion, then the name indicates which ion is present.

• Compounds containing only two elements have names ending in -ide.

• Compounds containing a compound ion have names that end with -ate.

• The names of some compounds use prefixes to tell you the number of that particular atom in the molecule.