![]() ![]() The parenthesis around the sulfate anion indicates three of the 2- sulfate ions are needed to balance 2 of the 3+ charged aluminum cations. An example is aluminum sulfate, Al 2(SO 4) 3. If you need to add a subscript to a polyatomic ion, enclose it in parentheses so it is clear the subscript applies to the entire ion and not to an individual atom.The carbonate anion (CO 3 -2) has a 2- charge, so there is no additional subscript. The sodium ion has a +1 charge, multiplied by the subscript 2 to get a total charge of 2+. An example is sodium carbonate, Na 2CO 3. The total charge for each ion is the subscript multiplied by the charge. If the charges on the cation and the anion are not equal, add subscripts as needed to the ions to balance the charge.Note that you do not ever write a subscript of 1. The strong attraction between positive and negative ions often produce crystalline solids that have high melting points. Potassium (K +) has a 1- charge, while chlorine (Cl -) has a 1- charge. Updated on JanuIonic compounds form when positive and negative ions share electrons and form an ionic bond. ![]()
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