The chemical formula of calcium oxide is Cao. What is the valency of calcium? If you answer it, I'll give you 100 points and mark you as the brainliest ​

2

Explanation:

In calcium oxide, the calcium is electropositive in nature and to fulfil its octet, the calcium atoms lose two electrons to form the calcium cations whose valency is 2, hence the corresponding anion, i.e. the oxide anion must also have valency 2 to balance the positive charge on the calcium cation.

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the ratio of the conjugate base to the acid required to attain the desired ph.