Write down the number of 3d electrons in ...

NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

Question : 36 of 49

Marks: +1, -0

Write down the number of 3d electrons in each of the following ions :

\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Cr}^{3+},

\mathrm{Mn}^{2+}, \mathrm{Fe}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Co}^{2+}, \mathrm{Ni}^{2+}

and

\mathrm{Cu}^{2+}

. Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

Solution:

\mathrm{Ti}^{2+}-3d^{2}

\mathrm{V}^{2+}-3d^{3}

\mathrm{Cr}^{3+}-3d^{3}

\mathrm{Mn}^{2+}-3d^{5}

\mathrm{Fe}^{2+}-3d^{6}

\mathrm{Fe}^{3+}-3d^{5}

\mathrm{Co}^{2+}-3d^{7}

\mathrm{Ni}^{2+}-3d^{8}

\mathrm{Cu}^{2+}-3d^{9}

Filling of orbitals in octahedral hydrated ions

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