8.36 Write down the number of 3d electrons in each of the following ions: Ti^{2+}, V^{2+}, Cr^{3+}, Mn^{2+}, Fe^{2+}, Fe^{3+}, Co^{2+}, Ni^{2+} and\; \; Cu^{2+}. Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

Answers (1)
M manish

For Ti^{2+} d-orvbital has two electron. So, filling of d-orbitals can be t^{2}_{2g}

In V^{2+}  d-orbital has three electron. So, the filling of d-orbital can be t^{3}_{2g}
Similarily

Cr^{3+}(Ions) d^{3} (No. of d electrons) t^{3}_{2g} (Filling of d-orbitals)
Mn^{2+} d^{5} t^{3}_{2g}, e^{2}_{g}
Fe^{2+} d^{6} t^{4}_{2g}, e^{2}_{g}
Fe^{3+} d^{5} t^{3}_{2g}, e^{2}_{g}
Co^{2+} d^{7} t^{5}_{2g}, e^{2}_{g}
Ni^{2+} d^{8} t^{6}_{2g}, e^{2}_{g}
Cu^{2+} d^{9} t^{6}_{2g}, e^{3}_{g}

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