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 - Topical Questions: 71c

Answer

$1s^22s^22p^63s^23p^6$

Work Step by Step

From the given information, we see that Al 3+ and Na+ are the two isoelectric species present, since they have the same number of electrons. We now write the electron configurations, using the information that we learned over the course of the chapter. Recall, we start at 1s and move up: $1s^22s^22p^63s^23p^6$
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