velancy of atomicity Ca(HCO3)2
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Hydrogen gas valency +1 and CO3 has valency -2. Now when u combine them together 1–2=-1 . Hence thevalency of HCO3 is -1. Similar us the case with other compounds like P04 havingvalency -3 , and so on.
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valancy is calcium 1
hydrogen 2
carbon 2
oxygen 6
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