Which of the following is the stable electronic configuration of $F e^{3 +}$ ion?

3 d^{6} 4 s^{0}

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3 d^{5} 4 s^{0}

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3 d^{6} 4 s^{2}

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3 d^{4} 4 s^{2}

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Solution

The correct option is C $3 d^{5} 4 s^{0}$
Iron $(F e)$ atomic number $26$ .Electronic configuration $= [A r], 4 s^{2} 3 d^{6}$
Electronic configuration of $F e^{3 +} = [A r] 4 s^{0} 3 d^{5}$

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Question 14

The pair of ions having same electronic configuration is.............

(a) $C r^{3 +}, F e^{3 +}$ (b) $F e^{3 +}, M n^{2 +} +$ (c) $F e^{3 +}, C o^{3 +}$ (d) $S C^{3 +}, C r^{3 +}$

3 d^{4} 4 s^{2}

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