Helium atom an atomic mass of 40u and two protons in its nucleus. How many neutrons does it have​

2 thoughts on “Helium atom an atomic mass of 40u and two protons in its nucleus. How many neutrons does it have​”

1. [tex] \texttt{Hence, the Helium atom has 2 neutrons.} [/tex]

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2. Answer: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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