2. Helium atom has an atomic mass
of 4 u and two protons in its
nucleus. How many, neutrons
does it have?
Answers
Answered by
3
since helium has atomic mass of 4u
number of protons and neutrons will be equal
i.e two protons and two neutrons
Answered by
1
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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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