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Lanthanide contraction is due to increase in
Options
(a) shielding by 4f electrons
(b) atomic number
(c) effective nuclear charge
(d) size of 4f orbital
Correct Answer:
effective nuclear charge
Explanation:
As we move through the lanthanide series. 4f electrons are progressively filled. The mutual shielding effect of electrons is very little, being even smaller than that of d electrons.The nuclear charge however increases by one at each step increasing the inward pull experienced by the 4f electrons and hence the reduction in the size of the 4f(n) shell. Sum of the successive reductions gives the total lanthanide contraction.
Related Questions: - The spin only magnetic moment of [CrF₆]⁴⁻ (atomic number for Cr is 24) is
- The IUPAC name of tert-butyl alcohol is
- The inert form of carbon is
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Topics: D and F Block Elements
(91)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The spin only magnetic moment of [CrF₆]⁴⁻ (atomic number for Cr is 24) is
- The IUPAC name of tert-butyl alcohol is
- The inert form of carbon is
- The oxidation numbers of hydrogen in KH,MgH₂ and NaH are respectively
- The element that does not show catenation among the following p-block elements is
Topics: D and F Block Elements (91)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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