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

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1. Mass number = No. of protons + No. of neutrons 

⇒ 4 = 2 + No. of neutrons 

⇒ No. of neutrons = 4 – 2 = 2 

2. Thus, the helium atom has 2 neutrons.

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