Answer
20
Work Step by Step
If there are 20 protons in an atom, then that means there has to be 20 electrons if the atom is neutral, for the numbers of protons and electrons are equal for a neutral atom.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 2, The Chemistry of Life - 2.1 - The Nature of Matter - 2.1 Assessment - Page 38: 1b
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