Crystal Field Theory describes the behavior of the electrons in the co-ordinate covalent bond of a
transitional element to it's various ligands, all in a complex.  If a HIGH FIELD STRENGTH ligand, is bonded
to the central atom, electrons are paired up BEFORE the would naturally bump up to a higher orbital.  

Take tri-cyano Iron (III)

the cyanide ligand is considered a HFSL (high field strength ligand) and would thus pair up all the
electrons in the 3d before bumping the remainder up.

It's a pain in the ass...Get a good text book.  Low field strength ligands do not exhibit this force on the
electrons and allow normal electron distribution following all the rules of establishing lowest
energy/highest entropy

edison <sb79s <at> yahoo.co.in> wrote:
HELLO FRIENDS

HAI CAN ANYONE PLEASE EXPLAIN THE CRYSTAL FIELD THEORY. I HAVE 
PRACTICALLY FACE A PROBLEM WHEN I AM ADDING LYE SOLUTION TO WATER  
FIRST THE CONDUCTIVITY SLIOGHLY INCREASE THEN DECREASE HOW DOES IT 
HAPPEND COULD U PLEASE EXPLAIN

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