Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 2 - Section 2.3 - Atomic Number, Mass Number, and Isotopes - Checkpoint - Page 49: 2.3.2



Work Step by Step

The mass number of an atom is the sum of the number of protons and neutrons in its nucleus. Oxygen has an atomic number of 8. This atomic number is the number of protons in the atom. If we add 8 to the number of neutrons in this particular atom of oxygen, which is 9, then we get a mass number of 17.
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