Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?
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  1. $Co^{2+}$
  1. $Cr^{3+}$
$Co^{2+} (3d^7)$ and $Cr^{3+} (3d^3)$ have $3$ unpaired electrons.
Hence they have almost same spin only magnetic moment.
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