Question

Helium atom has an atomic mass of 4uu of it's atomic no. Is 2 ,how many 'n'does it have?

Answer 1

Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass.

(((by using formula...

No. of protons(electrons)+no. of neutrons=mass number)))

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