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: 6.40a


$\Delta E$ would be positive in this electronic transition.

Work Step by Step

The change of energy $(\Delta E)$ is: - positive when the electron moves from a lower state (lower energy) to a higher state (higher energy). - negative when the electron moves from a higher state (higher energy) to a lower state (lower energy). The electron here moves from n = 4 to n = 9, meaning that it moves from a lower state to a higher state. Therefore, $\Delta E$ would be positive.
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