An element 'X' has its electronic configuration of 'K' shell is (n - 5)s2 and it has total number of electrons in its outermost, penultimate and antipenultimate shell are 2, 8 and 25 respectively, the

Question

An element 'X' has its electronic configuration of 'K' shell is (n - 5)s2 and it has total number of electrons in its outermost, penultimate and antipenultimate shell are 2, 8 and 25 respectively, then find out total number of unpaired electrons in element 'X' in their ground state.

Prashant Kotian · Accepted Answer

Correct answer: 7. X => 1s2/K so value of n is '6'. Electronic configuration of 'X' => 1s2 ... 4s2 4p6 4d10 4f7 5s2 5p6 5d0 6s2. Unpaired electrons is 7.

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