Helium atom has atomic mass of 4u and has 2 protons in its nucleus. How many nuetrons does it have
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Helium has 2 neutron
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Explanation:
Mass number of helium is equal to its atomic mass but has no units.
Mass number of helium = 4
No. of proton in nucleus = 2
Atomic number (z) of the element = 2
No. of neutrons (n) = A = -4 - 2 = 2
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