Helium atom has a mass number of four and two protons in its nucleus how many neutrons does it have??
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Mass no =no.of protons +no of neutrons
let x be no.of neutrons
4=2+x
x=2
so no of neutrons in He is 2
let x be no.of neutrons
4=2+x
x=2
so no of neutrons in He is 2
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No.of neutrons in He =4-2=2
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