Give the electron configuration of the given metal (atom/ions).
$C r^{3 +}$

[A r] 3 d^{1} 4 s^{2}

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[A r] 3 d^{2} 4 s^{1}

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[A r] 3 d^{3}

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none of these

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Solution

The correct option is B $[A r] 3 d^{3}$
Atomic no. of chromium is 24

Electronic configuration of $C r$ is $[A r] 3 d^{5} 4 s^{1}$
Electronic configuration of $C r^{3 +}$ is $[A r] 3 d^{3}$
or $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{0}$

Option (C) is correct.

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

[M (H_{2} O)_{6}]^{2 +}

M^{2 +}

[A r] 3 d^{8}

B e, M g, C a, S r

B a .

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