1. Name the three sub-atomic particles of an atom.
Answer
The three sub-atomic particles of an atom are:
(i) Protons
(ii) Electrons, and
(iii) Neutrons
2. Helium atom has an atomic mass of $4 u$ and two protons in its nucleus. How many neutrons does it have?
Answer
Number of neutrons $=$ Atomic mass - Number of protons Therefore, the number of neutrons in the atom $=4-2=2$
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