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An element X has electron configuration 1s2 2s

An element X has electron configuration 1s2 2s2 2p6 3s2 3p5. Which of the following statements is correct about the element?

A.

lt has a completely filled p-orbital

B.

lt has 5 electrons in its outermost shell.

C.

lt belongs to group ll on the periodic table

D.

lt is a halogen

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Correct answer is D

No explanation has been provided for this answer.

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