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29/12/2020 3:04 pm
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Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
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29/12/2020 3:05 pm
Mass number of helium = 4
Number of protons = 2
Number of neutrons (n)
= Mass number (A) - No. of protons (p)
= 4 - 2 = 2
Thus, no. of neutrons = 2