d) Formula writing and nomenclature: — This is the set of rules we must follow to establish the chemical formula and name of a pure substance . — Formulas contain: • Atomic symbols of the elements of the substance. • The symbol of the metal is written...
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d) Formula writing and nomenclature: — This is the set of rules we must follow to establish the chemical formula and name of a pure substance . — Formulas contain: • Atomic symbols of the elements of the substance. • The symbol of the metal is written first, then the non –metal symbol is written to the right. • Subscripts that indicate the number of atoms of each element. We do not write the subscript when it is 1 — For example: oxides, a binary compound • Oxides are combinations of oxygen with another element (mainly metallic elements of groups 1 and 2)
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