$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5}$ is the electron configuration of:

M n^{3 +}

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F e^{3 +}

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C r^{+}

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C o^{4 +}

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Solution

The correct options are
B $F e^{3 +}$
C $C r^{+}$
D $C o^{4 +}$
Electronic configuration:
$M n^{3 +} : [A r] 3 d^{4}$
$F e^{3 +} : [A r] 3 d^{5}$
$C r^{+} : [A r] 3 d^{5}$
$C o^{+ 4} : [A r] 3 d^{5}$

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C r^{2 +}

M n^{3 +}

[A r] 3 d^{6}

(A t o m i c N u m b e r : M n = 25, F e = 26, C o = 27, N i = 28)

F e^{3 +}

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) $S C^{3 +}, C r^{3 +}$

C r

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