Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 7 - Atomic Structure and Periodicity - Review Questions - Page 340: 5


Lithium has a larger second ionization energy.

Work Step by Step

Because lithium only has one valence electron, the second electron removed must come from the inner shell of electrons which requires much more energy. Beryllium, on the other hand, has two valence electrons, so both electrons removed will be from the outermost shell which will require much less energy.
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