![]() ![]() This is to show that the subscript applies to the entire polyatomic ion. ![]() The phosphate ion made more than one atom. Depending on the charge it may be classified as cations and anions Q3 Is phosphate a polyatomic ion Phosphate (PO 43-) is a polyatomic ion carrying a negative charge. If more than one of a particular polyatomic ion is needed to balance the charge, the entire formula for the polyatomic ion must be enclosed in parentheses, and the numerical subscript is placed outside the parentheses. Table of Polyatomic Ions ammonium, NH nitrite, NO phosphite, PO phosphate, PO hydrogen phosphate, HPO acetate acetate, CH3COO C2H3O carbonate, CO. What is a polyatomic element The is made up of two or more atoms, it can be referred to as a polyatomic ion or a molecular ion. A good way to recognize that there are two elements in the polyatomic is to see that there are two capital letters in the ion’s formula. The polyatomic ion has two elements, Chlorine and Oxygen, in it. That is, group 1 elements form 1+ ions group 2 elements form 2+ ions, and so on. Moving from the far left to the right on the periodic table, main-group elements tend to form cations with a charge equal to the group number. The rule for constructing formulas for ionic compounds containing polyatomic ions is the same as for formulas containing monatomic (single-atom) ions: the positive and negative charges must balance. The regular ion has just one element, Chlorine, in it. Note the usefulness of the periodic table in predicting likely ion formation and charge (Figure 2.29). ![]()
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