why Should we say that calcium valancy is 2
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because it has a valency of 2
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The valency of calcium is two because calcium belongs to group 2. Valency refers to the number of outer shell electrons required for a stable outer shell.
Explanation:
An element's valency is the measure of its ability to combine with other atoms to form chemical compounds or molecules.
Calcium is electropositive in nature, and to complete its octet, calcium atoms lose two electrons to create calcium cations with a valency of two, requiring the equivalent anion, the oxide anion, to have a valency of two to balance the positive charge on the calcium cation.
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