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

Explanation

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