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Chemistry CBSE Live product
Class 9 (2026-27)
Journey Inside the Atom
Atomic Models & Subatomic Particles
9.
Subatomic particles and atomic mass
Question:
2
m.
Choose the correct answer:
1.
Which subatomic particle contributes the least to the mass of an atom?
Proton
Neutron
Electron
Nucleus
2.
Why do larger atoms generally contain more neutrons than smaller atoms?
To help hold the positively charged protons together in the nucleus
To increase the number of electrons
To give the nucleus a negative charge
To make the atom lighter
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