The last electron of element \( \mathrm{X} \) has quantum numbers \( n=2, l=1, m=1, s=-1 / 2 \)....

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The last electron of element \( \mathrm{X} \) has quantum numbers \( n=2, l=1, m=1, s=-1 / 2 \). The position of \( X \) in the periodic table is
(A) group 2, period II
(B) group 18 , period II
(C) group 1, period III
(D) group 18 , period III
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