Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 2 - 2.2 - Concept Check: 1

Answer

Protons and neutrons are all approximately 1amu or atomic mass unit. The mass number of lithium with 3 protons and 4 neutrons is 7 amu.

Work Step by Step

1 proton = 1 amu 1 neutron = 1 amu 3 protons + 4 neutrons = 3 amu + 4 amu = 7amu, making the mass number of lithium 7. This is very close to the actual atomic mass of lithium which is 6.941
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