Answer:
Species
Electronic configuration
No. of unpaired electrons
(i)
\[M{{n}^{4+}}(Z=25)\]
\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}\,3{{d}^{3}}\]
3
(ii)
\[F{{e}^{3+}}(Z=26)\]
\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}\,3{{d}^{5}}\]
5
(iii)
\[C{{r}^{2+}}\,(Z=24)\]
\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}\,3{{d}^{4}}\]
4
(iv)
\[Z{{n}^{2+}}\,(Z=30)\]
\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\,3{{s}^{2}}3{{p}^{6}}\,3{{d}^{10}}\]
0
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