156k views
5 votes
Please Help.........................

Please Help.........................-example-1

2 Answers

1 vote
Its B i believe because protons and neutrons are found in the nucleus which makes up the mass of an atom
User Wahidullah Shadab
by
8.3k points
1 vote
B. Add the (mass) of protons and neutrons together.
User Mike Veigel
by
8.7k points