Answer
Neutron
Work Step by Step
Neutron and Proton have almost same mass. Mass of Neutron is $1.674929 x 10^{-27}$ kg and mass of proton is $1.672623 x 10^-{27}$ kg
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 4 - Section 4.3 - The Atom - Questions and Problems - Page 108: 4.16a
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