LANTHANIDE CONTRACTION
QUE : WHAT IS LANTHANIDE CONTRACTION ?
Ans : the decrease in ionic radii of elements in lanthanide series from La (57) to Lu (71) is called lanthanide contraction .
REASON : The Lanthanide Contraction is the result of a poor shielding effect of the 4f electrons.
CONSEQUENCES OF LANTHANIDE CONTRACTION :
1. elements of 4th row containing 4d and row 5th row containing 5d have very similar sizes .
IMPACT ON BASICITY : since bascity depends on the size of elements .SMALLER THE ELEMENT LESSER IS ITS BASICITY. so basicity of elements dereases as we move from La to Lu
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