PDF chapter test TRY NOW
1. Name the three sub-atomic particles of an atom.
| Protons | |
| Electrons | |
| Neutrons |
2. Helium atom has an atomic mass of \(4\) u and two protons in its nucleus. How many neutrons does it have?
Atomic mass \(=\) \(+\) Number of neutrons
Hence, the number of neutrons \(=\) .
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