Q. 2.     Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

Answers (1)

The atomic mass of Helium = 4 u 
No. of protons = 2

As atomic mass = no. of protons + no. of neutrons 
No. of neutrons  = At. mass - no. of protons
                          = 4 - 2

                          = 2 

Hence Heium atom has 2 neutrons.

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