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Na (Sodium) has a +1 charge. Kazyan: See above, but some exotic chemistry has produced sodium ions that are negative: -1.
Solution. Potassium ions have a charge of 1+, while sulfate ions have a charge of 2â. We will need two potassium ions to balance the charge on the sulfate ion, so the proper chemical formula is K2SO4. Calcium ions have a charge of 2+, while nitrate ions have a charge of 1â.We will need two nitrate ions to balance the charge on each calcium ion. The formula for nitrate must be enclosed in parentheses. Thus, we write Ca(NO3)2 as the formula for this ionic compound. chemical formula is a concise list of the elements in a compound and the ratios of these elements. To better understand what a chemical formula means, we must consider how an ionic compound is constructed from its ions.