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Page No 35: - Chapter 3 - Atoms & Molecules - Ncert Solutions class 9 - Science
Updated On 26-08-2025 By Lithanya
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Question 1:
Define atomic mass unit.
Answer:
Mass unit equal to exactly one-twelfth 
the mass of one atom of carbon-12 is called one atomic mass unit. It is written as ‘u’.
Question 2:
Why is it not possible to see an atom with naked eyes?
Answer:
The size of an atom is so small that it is not possible to see it with naked eyes. Also, the atom of an element does not exist independently.
