Helium atom has atomic mass of 4 U and two protons in the nucleus how many neutrons does it have
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2protons and 2 neutrons
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It has two neutrons because electrons do not have any significant mass and it already has 2 protons ,therefore.
divyam13:
sorey i cant understand but thank you
see we do not count the mass of electron
so only protons and neutrons are left
proton is 2
neutron is 2
2+2=4
4U
okay?
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