In lanthanides series from lanthanum to lutessium, atomic radius of elements sudden drops due to complex structure of 4f orbital. Due to its complex structure 4f orbital contains large number of lobes and these are out spreads. As a result 4f orbital can not causes strong shielding effect between nucleus and outermost electron. Hence, Nucleus attract outermost electron strongly. Hence, Sudden drop of atomic radius causes. This dropping of atomic radius in lanthanides are called lanthanides contraction. As a result it's ionization energy increases from Cs and Barellium. The elements of lanthanides IE shows slowly increase. All of the elements of lanthanides IE approximately simar and nearest due to f orbitals poor shielding.
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