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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 in called spectrochemical series.
The ligands with a small value of CFSE `(Delta_0)` are called weak field ligands whereas those with a large value of CFSE are called strong field ligands.
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