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NEETChemistryClassification of Elements and Periodicity in Properties

The correct increasing order of atomic radii of the elements Li , Na , K and Rb is

Options

  1. ARb K Na Li
  2. BLi K Na Rb
  3. CNa Li K Rb
  4. DLi Na K Rb

Correct answer

D. Li Na K Rb

Step-by-step solution

As we move down a group in the periodic table, the principal quantum number increases and new electron shells are added. This effect outweighs the increase in nuclear charge, causing the atomic radius to increase down the group. The given elements belong to Group 1 (alkali metals) and their order from top to bottom is Li , Na , K , Rb . Therefore, the correct increasing order of their atomic radii is Li Na K Rb . Answer: Li Na K Rb

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