Lesson eLearning

Which of the following particles is found in every atom and has a mass of about 1 atomic mass unit?

easy MCQ 1 mark Class 9 · Science · Structure of the Atom
  1. Proton
  2. Electron
  3. Neutron
  4. Photon
Answer
Proton

The correct answer is Proton — Select “Proton” as the correct choice.

Step-by-step solution

  1. Identify that the question asks for a particle present in every atom.
  2. List common subatomic particles: proton, neutron, electron, photon.
  3. Recognise that only the proton has a mass ≈1 amu and is found in all atoms.
  4. Select “Proton” as the correct choice.
Common mistake: Confusing neutron with proton

Concept tested: Subatomic particles

Published · How this solution was prepared and checked

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