Question

The chemical formula of calcium oxide is Cao. What is the valency of calcium?

Answer 1

Answer:

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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Answer 2

Lets look out the Electronic configuration of Calcium(Ca)

• Z=20

EC:-

$\\ \rm\longmapsto 1s^22s^22p^63s^2$

• Valency is 2