Answer
(C) The number of neutrons.
Work Step by Step
Isotopes have the same number of protons and electrons, but different number of neutrons.
Atomic number is the number of protons only.
Microbiology with Diseases by Body System (4th Edition)
by Bauman, Robert W,, PhD
Published by
Benjamin Cummings
ISBN 10:
032191855X
ISBN 13:
978-0-32191-855-0
Chapter 2 - The Chemistry of Microbiology - Questions For Review - Multiple Choice - Page 53: 3
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