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What is spectrochemical series? Explain ...

What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

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The arrangement of ligands in order of their increasing field strengths, i.e., increasing crystal field splitting energy (CFSE) values is called spertrochemical series
The ligands with small value of CFSE `(Delta_(0))` are called weak field ligands whereas those with large value of CFSE `(Delta_(0))` are called strong field ligands.
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