Which of the following species is expected to show the highest magnetic moment? (At. Nos.: $Cr=24$,  $Mn = 25$,  $Co = 27$,  $Ni = 28$,  $Cu = 29)$ 

  • A

    $C{r^{2 + }}$

  • B

    $M{n^{2 + }}$

  • C

    $C{u^{2 + }}$

  • D

    $C{o^{2 + }}$

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