Ncert Exercises & Solutions

8.36 Write down the number of 3d electrons in each of the following ions: Ti2+, V2+, Cr3+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+ and Cu2+. Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

Metal ions and its configuration is as follows:

Metal ion	Number of d-electrons	Filling of d-orbitals
Ti $^{2 +}$	2	t $_{2 g}^{2}$
V $_{2 +}$	3	$t_{2 g}^{3}$
Cr $^{3 +}$	3	$t_{2 g}^{3}$
Mn $^{2 +}$	5	$t_{2 g}^{3} e_{g}^{2}$
Fe $^{2 +}$	6	$t_{2g}^{4} e_{g}^{2}$
Fe $^{3 +}$	5	$t_{2 g}^{3} e_{g}^{2}$
Co $^{2 +}$	7	$t_{2g}^{5} e_{g}^{2}$
Ni $^{2 +}$	8	$t_{2g}^{6} e_{g}^{2}$
Cu $^{2 +}$	9	$t_{2g}^{6} e_{g}^{3}$

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