Gradual decrease in atomic and ionic radii from Ce3+ to Lu3+ is called
A
Actinide contraction
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B
Lanthanide contraction
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C
Both (A) and (B)
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D
None of these
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Solution
The correct option is B Lanthanide contraction Lanthanide contraction is the gradual decrease in atomic and ionic radii from Ce3+ to Lu3+. As the electron falls into 5f orbitals the ENC (Effective Nuclear Charge) increases and this brings valence shell nearer to the nucleus resulting in lanthanide contraction.