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what do u mean by lanthanoid contraction

In the atoms of lantanoids ,the nuclear charge increases with atomic number and the added electrons go to the inner 4f orbitals .The shielding effect of 4f electrons from the increased nuclear charge is poor .Thus as the atomic number increases ,the effective nuclear charge experienced by each 4f electron increases .This cause a slight reduction in the entire 4f shell .The successive contractions accumulate and the tool effect for all the lanthanoids is called lanthanoid contraction .


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