Question

If $P>{\Delta }_0$ then electronic confirguration of $d^5$ in octahedral complex:

• A. $t_{2g}^{5}e{g}^0$
• B. $t_{2g}^{3}e{g}^2$
• C. $t_{2g}^{4}e{g}^1$
• D. $e{g}^5{t}_{2g}$

Answer 1

Answer: (B)

$t_{2g}^{3}e{g}^2$

If pairing energy $P$ is graetare than ${△}_o$ then passing of electron (when less than half filled configuration) do not takes place (not favourable), and hence configuration is $t_{2g}^{3}e{g}^2$ rather than $t_{2g}^{5}e{g}^o$ in which $P<{△}_o$