Question

Hi I have a doubt , in solutions under structure of an item, pg 49 - Helium has 2 protons and an atomic mass of 4u how many neutrons does it have ? how wont there be any change as mentioned in the solution?

Answer 1

Atomic no. of He = 2
Mass no. of He = 4

No. of neutrons = Mass no. - Atomic no. = 4 - 2 = 2