The nucleus of a helium atom has two protons and has an atomic mass of 4 u. In an atom, how many neutrons are there?
Answer (1)
The total of the masses of protons and neutrons in an atom's nucleus is known as its atomic mass.
Given that the mass of the helium atom is 4 u and two protons are present in its nucleus.
So the number of neutrons will be
Number of neutrons = atomic mass − number of protons
Number of neutrons = 4−2
∴Number of neutrons = 2
Therefore, the helium atom has 2 neutrons
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