Helium atom has an atomic mass …
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Yogita Ingle 5 years, 4 months ago
The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus.
Mass of atom =Protons +Neutrons
Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass.
4u =2u +Neutrons
Neutrons =4-2 =2
Hence, it must contain 2 neutrons.
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