Helium atom has an atomic mass of 4 u and two protons in its nucleus How many neutrons does it have CBSE Class9 Chemistry 2013
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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? CBSE- Class9- Chemistry 2013

CBSE- Class9- Chemistry 2013


By:Fututron

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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
Concept insight: Recall the correct formula for atomic number and mass number.

13priya

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