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NEETChemistryClassification of Elements and Periodicity in Properties

Consider the following two statements Statement I: Among Mg , Al , Mg ²⁺, Al ³⁺ the one having smallest size is Al ³⁺Statement II: Eu is having exceptionally high atomic radii among lanthanide elements The correct answer is

Options

  1. ABoth statements I and II are correct
  2. BBoth statements I and II are not correct
  3. CStatement I is correct but statement II not correct
  4. DStatement I is not correct but statement II is correct

Correct answer

C. Statement I is correct but statement II not correct

Step-by-step solution

Al atom is smaller than Mg atom as Al lies to the right of Mg and it has greater effective nuclear charge. A cation is smaller than its parent atom so Al ³⁺ is smaller than Al and therefore Al ³⁺ is smallest in size. Thus, statement I is correct. Among lanthanides there is a gradual decrease in the atomic and ionic radii as we move from left to right due to lanthanoid contraction. As per the latest data from rsc.org; the atomic radii of Sm, Eu and Gd are:- aligned & Sm =236 pm , 185 pm (covalent) & Eu =235 pm , 183

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