Write down the number of 3𝑑 electrons in each of the following ions:
$T i^{2 +}, V^{2 +}, C r^{3 +}, M n^{2 +}, F e^{2 +},$
$F e^{3 +}, C o^{2 +}, N i^{2 +}$ and $C u^{2 +}$
Indicate how would you expect the five $3 d$ orbitals to be occupied for these hydrated ions (octahedral).

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Solution

Crystal field splitting in octahedral complex

In an octahedral complex, the $d -$ orbitals of the metal cation are split into two sets of different energies, $t_{2 g}$ of lower energy and $e_{g}$ of higher energy.

Number of electrons in $3 d$ subshell

$Metal ion$ $Number of d-electrons$ $Filling of d-orbitals$

$C u^{2 +}$ $9$ $t_{2 g}^{6} e_{g}^{3}$

$N i^{2 +}$ $8$ $t_{2 g}^{6} e_{g}^{2}$

$C o^{2 +}$ $7$ $t_{2 g}^{5} e_{g}^{2}$

$F e^{3 +}$ $5$ $t_{2 g}^{3} e_{g}^{2}$

$F e^{2 +}$ $6$ $t_{2 g}^{4} e_{g}^{2}$

$M n^{2 +}$ $5$ $t_{2 g}^{3} e_{g}^{2}$

$C r^{3 +}$ $3$ $t_{2 g}^{3}$

$V^{2 +}$ $3$ $t_{2 g}^{3}$

$T i^{2 +}$ $2$ $t_{2 g}^{2}$

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Similar questions

C u^{2 +}, N i^{2 +}, C o^{2 +}, F e^{2 +}

M n^{2 +}

Question 14

The pair of ions having same electronic configuration is.............

(a) $C r^{3 +}, F e^{3 +}$ (b) $F e^{3 +}, M n^{2 +} +$ (c) $F e^{3 +}, C o^{3 +}$ (d) $S C^{3 +}, C r^{3 +}$

Writedown the number of 3d electrons in each of the following ions:

Ti²⁺,V²⁺,Cr³⁺,Mn²⁺,Fe²⁺,Fe³⁺,CO²⁺,Ni²⁺and Cu²⁺.

Indicatehow would you expect the five 3d orbitals to be occupied for thesehydrated ions (octahedral).

M^{2 +}

Z n^{2 +} > S c^{2 +} = C u^{2 +} > T i^{2 +} = N i^{2 +} > V^{2 +} = C o^{2 +} > C r^{2 +} = F e^{2 +} > M n^{2 +}

{Cu}^{2 +}, {Ni}^{2 +}, {Fe}^{3 +} and {Cr}^{3 +}

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