(Ignore persulfate as it’s an exception to the general rule.) Name We can similarly predict sulfite and hyposulfite once we know the formula and charge of sulfate. How about hypochlor ite? The prefix hypo- and the suffix -ite mean it has two less O atoms than chlorate, so it must be ClO –. ![]() What would chlor ite be? The suffix -ite means it has one O atom less than chlorate, so it must be ClO 2 –. Notice only the number of oxygen atoms changed, the charge did not. Since it has the prefix per- and the suffix -ate, it must have one O atom more than chlorate, meaning the formula is ClO 4 –. Let’s look at the chart above and see if we can figure out what perchlor ate would be. Once you know the polyatomic ions that end in the suffix -ate there are only a few more patterns to know and you’ll be on your way to naming dozens and dozens of polyatomic ions! Increasingįor example, let’s use chlorate as an example. In group 15/VA, P and As have the same pattern, but notice N is different, combining with only three oxygens and having only a 1- charge. In group 16/VIA, both S and Se have the same pattern. Cl combines with three oxygens and has a 1- charge Br combines with three oxygens and has a 1- charge I combines with three oxygens and has a 1- charge. For example, if you know that chlorate is ClO 3 –, then you can predict that all of the other oxyanions made from nonmetals in group 17/VIIA follow the same pattern.
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