what are isopoly and heteropoly anions or cations and what is unique among them as compare to other anions or cations..?
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Isopoly and heteropoly anions. The amphoteric metals of groups VB (vanadium, niobium, and tantalum) and VIB (chromium, molybdenum, and tungsten) in the +5 and +6 oxidation states, respectively, form weak acids that readily condense (polymerize) to form anions containing several molecules of the acid anhydride.
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