Consequently,
the orbital splitting energies are not
sufficiently large for forcing pairing and,
therefore, low spin configurations are rarely
observed The ‘g’ subscript is used for the
octahedral and square planar complexes
which have centre of symmetry Since
tetrahedral complexes lack symmetry, ‘g’
subscript is not used with energy levels Not in visible
region
Rationalised 2023-24
134
Chemistry
   It is important to note that
in the absence of ligand,
crystal field splitting does
not occur and hence the
substance is colourless