issb general knowledge MCQ #724

Lightest element on periodic table?

issb general knowledge MCQ #724

  1. Question 1

    Q1. Lightest element on periodic table?

    • A) Helium
    • B) Hydrogen
    • C) Lithium
    • D) Oxygen

    Answer: Hydrogen

    Explanation: Hydrogen has atomic number 1 and is the lightest element. This fact often appears in ISSB academic and general knowledge sections.