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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?

NCERT Class IX
Sciences - Exemplar Problems

Chapter 4. Structure of the Atom

Answer :

2 u as proton and neutron has same no.
kvnmurty
atomic mass number = number of neutrons + number of protons
       number of neutrons = 4 - 2 = 2

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