Chemistry: An Atoms-Focused Approach

Published by W. W. Norton & Company
ISBN 10: 0393912345
ISBN 13: 978-0-39391-234-0

Chapter 4 - Chemical Bonding - Questions and Problems - Page 178: 21

Answer

There are two elements in which the valence electrons equal their atomic numbers: hydrogen and helium.

Work Step by Step

Hydrogen's atomic number is 1, and it has 1 valence electron. Helium's atomic number is 2, and it has 2 valence electrons.
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