Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 5 - Electron Configurations and the Periodic Table - Questions for Review and Thought - Applying Concepts - Page 240f: 128d

Answer

There are no electrons left.

Work Step by Step

Helium has no electrons left after the second ionization. Thus, it is impossible for it to have a third ionization energy since there are not three electrons to remove from a neutral helium atom.
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