Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 6 - Electronic Structure of Atoms - Exercises: 6.73a

Answer

Valence electrons are the electrons involved with chemical bonding. They are part (and sometimes all) of the outer-shell electrons, which are the electrons given after the noble gas core.

Work Step by Step

For example, $$Li: [He]2s^1$$ $[He]$ is the noble gas core. $2s^1$ refer to 1 outer-shell electron. And in this case, this outer-shell electron is also the valence electron. (For elements with atomic number of 30 or less, all outer-shell electrons are valence electrons)
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