Which element in group 6A is not found as the central atom in compounds with an expanded valence shell?

Name: Which element in group 6A is not found as the central atom in compounds with an expanded valence shell?
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Question

Quizplus · Accepted Answer

Oxygen is the only element in group 6A that does not form compounds with an expanded valence shell. This is because oxygen has a small atomic radius and a high electronegativity, which makes it difficult for it to accommodate more than eight electrons in its valence shell.

Which Element in Group 6A Is Not Found as the Central