Which of the following has the smallest atomic radius?

Options

  • A. Sodium
  • B. Magnesium
  • C. Aluminium
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

C. Aluminium

Detailed Explanation

Na, Mg and Al are in Period 3. Atomic radius decreases from left to right across the period, making aluminium the smallest among these three.