Question 7 — Assertion (A): The discovery of - Questions at the end of the chapter - Chapter 8 - Journey Inside the Atom (Exploration)

Last updated at July 3, 2026 by

Question 7
Assertion (A): The discovery of subatomic particles helped in understanding the atomic structure. Reason (R): The number of electrons is equal to the number of protons in an atom. Choose the correct option: (i) Both A and R are true, and R is the correct explanation of A. (ii) Both A and R are true, but R is not the correct explanation of A. (iii) A is true, but R is false. (iv) A is false, but R is true.
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Answer: (ii)

  • Both A and R are true .
  • But R (electrons = protons, i.e. neutrality) is not the correct explanation of A (why discovering particles helped understand structure).
A Neutral Atom Protons equal electrons So the atom is electrically neutral
Back to: 8.5 Atomic Number
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