Helium atom has an atomic mass of 4u and two protons in it nucleus. How many neutrons does it have?
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Answer:
2 neutrons
Explanation:
The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus. Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass. Hence, it must contain 2 neutrons.
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