Question

An electrically neutral atom consists of 15 neutrons, 13 electrons, and a number

of protons. What is its mass number?

A.13

B.15

C.28

D.30

Answer 1

Answer:c

Explanation: it states that the atom is neutral, meaning the number of electrons and protons are the same. so if there are 13 electrons, there are 13 protons. And the mass number is neutrons plus protons. So 13+15 is 28