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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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