Question

what is the mass of the atom containing three protons two electrons and four neutrons​

Answer 1

hdhdgdhsvfejwbwgwbegejeveuehdvhdkdldgxdbekowfeg

Answer 2

This example may lead you to believe that atoms have the same number of protons and neutrons, but further examination of the Table above will show that this is not the case. Lithium, for example has three protons and four neutrons, leaving it with a mass number of 7.