The metals by themselves do not have chemical formulas, they have chemical symbols which are shown on the Periodic Table of the elements. They only have chemical formulas if they are chemically bonded to another element, usually a nonmetal.
Some of the transition state metals are multivalent.
Co2
The chemical symbol for Silver is Ag
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The large numbers in front of some chemical formulas are called coefficients. They represent the ratio of moles of each substance in a chemical reaction and are used to balance the equation.
The most prominent constituent in the atmosphere which reacts with some metals, though not all, is oxygen. The resultant chemical would be an oxide of the metal concerned.
Chemical Formulas