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NDA 2023 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · medium

Among the following elements of the third period, the one with the largest atomic radius is

Single correct option

Among the following elements of the third period, the one with the largest atomic radius is
  1. A. Magnesium
  2. B. Sodium
  3. C. Aluminium
  4. D. Chlorine
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Answer: (B) Sodium

Across a period the nuclear charge rises while electrons are added to the same shell, so atoms shrink from left to right. Sodium, being at the extreme left, has the largest atomic radius among these.
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Original question written in the NDA 2023 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake