What is covalency of chlorine atom in second excited state?

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answer is 5.

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Detailed Solution

In its second excited state, another valence electron of Cl excited to empty 3d orbital and its electronic configuration becomes [Ne]3s²3p³3d². As there are five unpaired electrons, therefore it can form five bonds. This implies that at the second excited state of Cl, covalency of Cl is 5.

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