For the four successive transition elements ( 
and 
), the stability of 
oxidation state will be there in which of the following order
At. nos. 
Text Solution
Verified by ExpertsA
The order can be explained using the idea of spin correlation. Spin
correlation refers to lowering of energy for like (parallel) spins. Spin correlation leading to decrease in repulsion for electrons of like spins than for electrons of different spins is called exchange energySpin correlation and its exchange energy gives an electronic configuration a special stability which is greatest for half‐filled electronic configurations.
getsstabilisation due to half‐filled configuration.
In 
the placing of one extra electron in a subshell destabilises. Placing of 2 electrons in 
destabilises it more. 
has one vacant subshell. 
gets more stabilisation compared to 
through exchange energy So the order is as follows: 
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