Q. Which of the following is the lightest element?

  • (A) Helium
  • (B) Hydrogen
  • (C) Lithium
  • (D) Carbon
✅ Correct Answer: (B) Hydrogen
Explanation: Hydrogen is the lightest element with atomic number 1 and atomic mass approximately 1 u.

Published by Jyoti ⭐ 1.79K Points at 16-Jun-2026 06:40 am in Chemistry

Explanation by: Jyoti
Hydrogen is the lightest element with atomic number 1 and atomic mass approximately 1 u.

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