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Writing Ionic Compound Formulas: Binary & Polyatomic Compounds

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❶So you will have two sodium atoms or Na 2. So here, the nitrate ion is the polyatomic ion, while the sodium ion is the monoatomic ion.

Sample Binary Ionic Compounds

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Polyatomic ions are just that – ions – and therefore always have a charge associated with them. Whenever a polyatomic ion is written as a chemical formula (as opposed to part of a compound), the charge must accompany it. For example, the polyatomic anion nitrate is written as NO

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- Writing Formulas for compounds containing polyatomic ions Follow these simple steps to write chemical formulas for ionic compounds containing polyatomic ions. Click on and find the icon to learn the names, formulas and charges from the list of polyatomic ions for this course.

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Writing formulas for polyatomic ionic compounds isn't hard when you know the formula for the polyatomic ion. There are many tables available that show the formula . Polyatomic Ionic Formula Writing Name___KEY____ Name Ions Formula sodium sulfate Na+1 SO Na2SO4 lithium phosphate Li+1 PO Li3PO4 aluminum acetate Al+3 C2H3O Al(C2H3O2)3.

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Note: Greek prefixes are not used to indicate the number of atoms, or polyatomic ions, in the formula unit for the compound (e.g., Ca(NO 3) 2 is named "calcium nitrate" not "calciuim dinitrate"). Ionic compounds are (usually) formed when a metal reacts with a nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other. Since hydrogen is a nonmetal, binary compounds containing hydrogen are also usually covalent compounds.