Helium atom has an atomic mass of 4 u and two proton in its nuclrus how many neutron does it have
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Your answer is right here................
Helium atom has 2 neutrons and 2 protons.
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Helium atom has two neutrons.
The mass of an atom is the sum of the masses of protons and neutrons present in its nucleus.
Since helium atom has two protons, mass contributed by the two protons is (2 × 1) u = 2 u.
Then, the remaining mass (4 − 2) u = 2 u is contributed by 2u/1u = 2 neutrons.
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