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A $M^{+ 2}$ ion derived from a metal in the first transition metal series bas four electrons in $3 d$ subshell. What element may M be?

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Correct option is B

Electronic configuration of $M^{2 +}$ ion $= [A r] 48^{\circ} 3 d^{4} (e^{-} = 22)$

Electronic configuration of M atom $= [A r] 4 s^{1} 3 d^{5} (e^{-} = 24)$

atomic no. of $Cr = 24$

Electronic configuration of $C r = [A r] 4 s^{1} 3 d^{5}$

Therefore the M atom is chromium $(Cr)$

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A M+2 ion derived from a metal in the first transition metal series bas four electrons in 3d subshell. What element may M be?