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Atoms & Elements

Atomic structure, periodic table, chemical bonding and valency

Sample Practice Questions

  1. The atomic number of sodium (Na) is:

    • 10
    • 11
    • 12
    • 23
    Show answer

    Answer: 11

  2. The molecular formula of ammonia is:

    • N₂H₄
    • NH₃
    • NH₄
    • N₂H₂
    Show answer

    Answer: NH₃

  3. Which subatomic particle has no charge?

    • Proton
    • Electron
    • Neutron
    • Positron
    Show answer

    Answer: Neutron

  4. Alkali metals are present in which group of the periodic table?

    • Group 1
    • Group 2
    • Group 17
    • Group 18
    Show answer

    Answer: Group 1

Practise 20 questions →
Practice Questions

Practice 20 randomly selected NTSE questions on Atoms & Elements. Answers are revealed after each question.

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