Question

1. The expression that represents the mass of an atom is:

a) p+ + n
b) e- + n
c) p+ + e-
d) p+ + e. + n​

Answer 1

It is the a) p+ + n

Step by step explanation:

`\large\boxed{ \bold{A=p^(+)+n}}`

Protons are used since they do not change, otherwise with electrons, of which some elements can give or receive them.