Answer
The neutron is the most massive.
Work Step by Step
The mass of a proton is about 1.672623 x 10-27 kg, the mass of a neutron about 1.674929 x 10-27 kg and that of the electron 9.109390 x 10-31 kg. Therefore, the most massive is the neutron.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.21d
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