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Helium atom has an atomic mass of 4u and...

Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have ?

Text Solution

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Mass number of helium is equal to its atomic mass but has no units
Mass numbr (a) of helium =4
No of protons in te nucleus =2
Atomic numer (z) of the element =2
No of neutrons (n) = A = -4 - 2 = 2
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