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what is the valency of calcium in CaCo3???

 Calcium-2

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Calcium Carbonate
Formula is CaCO3
Valency of Ca is 2 and oxidation state is +2
Valency of C is 4 and the valency of O is 2 , but overall oxidation state for CO3 is -2

:) :)

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calcium +2 and in carbonate -2 

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THANKKSS

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in all cases Ca is +2 because in periodic table calcium has 20th position so it's shells are:

2,8,8,2 to become stable it should leave the charge 2

by the way this is in the next chapter

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