Answer
Protons and neutrons
Work Step by Step
The nucleus is made up of protons and neutrons which make up the total mass of the nucleus and most of the mass of the atom.
Chemistry (12th Edition)
by Wilbraham
Published by
Prentice Hall
ISBN 10:
0132525763
ISBN 13:
978-0-13252-576-3
Chapter 4 - Atomic Structure - 4 Assessment - Page 122: 46
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