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The decrease in atomic size of the d-block elements in a series is small after midway.(a) True(b) FalseThis question was posed to me in an internship interview.This key question is from General Properties of the Transition Elements (D-Block) in division D and F-Block Elements of Chemistry – Class 12

Answer»

The correct choice is (a) True

Easy explanation: In the BEGINNING of the series, the atomic radius decreases with increase in atomic number as the NUCLEAR charge increases and the SHIELDING effect of the d-electrons is small. After midway, the INCREASED number of d-electrons show an increase in shielding effect which counterbalances the increase in nuclear charge. Therefore, the decrease in atomic radius post midway is MINIMAL.



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