Question

What is variable co valency? Show the variable covalency of

phosphorus....
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Answer 1

Explanation:

since the valency of phosphorus is 3 but they can expand their valency ,because of the vacent d orbital. it should be 3 because phosphorus has 5 electron in its valence shell. therefore it accept 3 electron and complete its octet because accepting 3 electron would be much easier than to donate 5 electrons.