If in given compounds number of substituents are integral multiple of central atoms (except P4O6,P4O10,P4S3,P4S10,(CH2)6N4,B4Cl4) the compounds will be cyclic structure. And number of central atoms must be three (3) or more than three.
Meta phosphoric acids and their salts always exist in dimeric, trimeric, tetrameric or in polymeric linear as
well as cyclic form, not in monomeric form due to the presence of weak
(2p-3d- pi bond) bond the sodium salts of trimer and hexamer is very famous
salts.
How to find oxy-linkage present in a given oxy-acid:
Related Questions:
What are "Ortho" or "Meta" oxyacids?
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