How to find the valency of molecules like oxide hydrogen carbonate nitrate etc.......
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The term "valence" or "valency" is used in chemistry to describe the potential an element or molecule has to bond. Similar to oxidation number and formal charge of an ion, the valency of an atom or molecule can be described as how many hydrogen atoms it can bond with. Radicals are similar to polyatomic ions, only without a formal charge. They are groups of atoms that can readily react with other elements and compounds.
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Hydrogen gas valency +1 and CO3 has valency -2. Now when u combine them together 1–2=-1 . Hence the valency of HCO3 is -1.
Similar us the case with other compounds like P04 having valency -3 , and so on.
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