Chemistry

Which one of the following has the largest atomic radius ?

  1. Sodium
  2. Potassium
  3. Magnesium
  4. Aluminium

Periodic Table

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Answer

Potassium.

Reason — Sodium (Na), Magnesium (Mg) and Aluminium (Al) belong to period 3 whereas Potassium (K) belongs to period 4. As atomic size increases on moving down the group hence, Potassium has the largest atomic radius of the given elements.

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