Answer
b. Excited-state
Work Step by Step
An atom with the configuration $1s^22s^22p^43s$ has more energy than an atom with a configuration of, say, $1s^22s^22p^5$ where the that $3s$ electron is now in a $2p$ state.
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0133942651
ISBN 13:
978-0-13394-265-1
Chapter 41 - Atomic Physics - Stop to Think 41.4 - Page 1193: 1
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