Question

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Helium atom atom has an atomic mass of 4 unit and two protons in the nucleus how many neutrons does it have??


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Answer 1

Explanation:

→2 neutrons

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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Answer 2

Explanation:

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:- 2 neutrons