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Chemistry CBSE Live product
Class 9 (2026-27)
Journey Inside the Atom
Atomic Models & Subatomic Particles
7.
Discovery of structure of the atom
Question:
2
m.
Identify the correct answer:
1. Observe the given model of the atom and choose the correct scientist who proposed it.
Niels Bohr
J. J. Thomson
John Dalton
Ernest Rutherford
2.
Why did scientists suspect the presence of neutrons in the nucleus?
The mass of atoms could not be explained by protons alone.
Electrons were found inside the nucleus.
Helium has fewer protons than hydrogen.
Protons have no mass.
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