Per- prefix

Pauling, L., 78, 107 pencil lead, 191 penetration, 33 penicillin decay, 533 pentagonal bipyramidal, 97 pentane, 183 peptide, 771 peptide bond, 771 per- prefix, F31 percentage dcprotonation, 415... 

There are special naming rules for acids that correspond with the suffix of their corresponding anion if hydrogen were removed from the acid. Anions ending with -ide correspond to acids with the prefix hydro- and the suffix -ic. Anions ending with -ate correspond to acids with no prefix that end with -ic. Oxoanions ending with -ite have associated acids with no prefix and the suffix -ous. The hypo- and per- prefixes are maintained. Some examples are shown in the following table ... 

In the case of the chlorate ion, C103 , the oxyion with one more oxygen, C104", adds a per- prefix to chlorate, becoming perchlorate ion. The oxyion with one less oxygen than the chlorite, C102 , is the hypochlorite ion, CIO". Chlorine is one of the few elements that can form four different oxyions. 

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