22.3 – Writing formulas and Naming Compounds. Binary Ionic Compounds. A binary compound is a compound composed of two elements To write a chemical formula for a binary compound, you need to know: which elements are involved
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1. Write the symbol of the element (or polyatomic ion) with the positive oxidation number or charge
2. Write the symbol of the element (or polyatomic ion) with the negative oxidation number or charge
3. The charge (without the sign) of one ion becomes the subscript of the other ion.