Campbell Biology: Concepts & Connections (9th Edition)

Published by Pearson
ISBN 10: 0-13429-601-X
ISBN 13: 978-0-13429-601-2

Chapter 2 - Review - Page 35: 12

Answer

C) 23

Work Step by Step

Mass Number = protons + neutrons (After all, electrons are essentially massless compared to protons and neutrons, so we add the number of protons and neutrons (which each weigh one atomic mass unit) to get the overall atomic mass.)
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