The electronic configuration for \( { }_{26} \mathrm{Fe} \) is: (A) \( [\mathrm{Ar}] 3 d^{6}, 4 ...

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The electronic configuration for \( { }_{26} \mathrm{Fe} \) is:
(A) \( [\mathrm{Ar}] 3 d^{6}, 4 s^{2} \)
(B) \( [\mathrm{Ar}] 3 d^{7}, 4 s^{2} \)
(C) \( [\mathrm{Ar}] 3 d^{5}, 4 s^{2} \)
(D) \( [\mathrm{Ar}] 3 d^{7}, 4 s^{1} \)
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