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easyMCQAIEEE2026Chemistry
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Which of the following factors may be regarded as the main cause of lanthanide contraction?

  1. A
    Poor shielding of one of electron by another in the subshell
  2. B
    Effective shielding of one of electrons by another in the subshell
  3. C
    Poorer shielding of electrons by electrons
  4. D
    Greater shielding of electrons by electrons

Solution & Step-by-step Explanation

The -orbitals have a very diffused shape, resulting in very poor shielding of the nuclear charge. As the atomic number increases, the increased nuclear charge pulls the electron cloud closer, leading to a contraction in size.

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Which of the following factors may be regarded as the main cause of lanthanide contraction?
A
Poor shielding of one of electron by another in the subshell
B
Effective shielding of one of electrons by another in the subshell
C
Poorer shielding of electrons by electrons
D
Greater shielding of electrons by electrons

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f-Block ElementsLanthanide ContractionShielding

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