Among the following, the element with the lowest atomic number that has a ground-state electroni...
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3Among the following, the element with the lowest atomic number that has a ground-state electronic configuration of \( (n-1) \mathrm{d}^{6} n \mathrm{~s}^{2} \) is located in the
(A) fifth period
(B) sixth period
(C) fourth period
(D) third period
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