A __________ at the bottom right side of a chemical symbol represents the number of each type of ion in the chemical formula of an ionic compound. Which best completes the statement?

A subscript is the small number written at the bottom right of a chemical symbol. It shows how many of that type of ion are represented in the formula; for example, the 2 in CaCl₂ indicates two chloride ions. So the best completion is “subscript.”

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