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D and F Block Elements question

2014 · Q97
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D and F Block Elements question

2014 · Q97

NEETChemistryD and F Block ElementsMCQ+4 / −1
Reason of lanthanoid contraction is
  1. A
    negligible screening effect of 'f'- orbitals
  2. B
    increasing nuclear charge
  3. C
    decreasing nuclear charge
  4. D
    decreasing screening effect.
View written solutionFree

Correct answer: A

The shape of f-orbitals is very much diffused and they have poor shielding effect. The effective nuclear charge increases which causes the contraction in the size of electron charge cloud. This contraction in size is quite regular and known as lanthanoid contraction.

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