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NEET Chemistry QUESTION #7404
Question 1
Among Ca, Mg, P, and Cl, the order of increasing atomic radii is:
  • \(\text{Cl} < \text{P} < \text{Mg} < \text{Ca}\)✔️
  • \(\text{P} < \text{Cl} < \text{Ca} < \text{Mg}\)
  • \(\text{Ca} < \text{Mg} < \text{P} < \text{Cl}\)
  • \(\text{Mg} < \text{Ca} < \text{Cl} < \text{P}\)
Correct Answer Explanation
Periodic trend of atomic radius:
  • Across a period: decreases left to right (increasing Z*)
  • Down a group: increases (new shells added)
Cl and P are in Period 3 (Cl < P in size). Mg and Ca are in Group 2 (Mg < Ca). Across Period 3: Cl < P < Mg.

So increasing order: Cl < P < Mg < Ca