Match the atoms/ions given in Column-I with the number of unpaired electrons possessed by them as given in Column-II.
\[
\begin{array}{llll}
(a) & Cr & (p) & 1 \\[6pt]
(b) & Mn^{2+} & (q) & 3 \\[6pt]
(c) & N & (r) & 5 \\[6pt]
(d) & Sc^{2+} & (s) & 6
\end{array}
\]