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What is crystal field splitting energy? ...

What is crystal field splitting energy? How does the magnitude of `triangle_(0)` decide the actual configuration of d orbitals in a coordination entity?

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When ligands approach a particular metal ion. The d-orbitals split into two sets. One with lower energy while the other with higher energy, the difference of energy between the two sets orbitals is known as crystal field stablising energy (CFSE), for more details, consult section 11 .
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