Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 7 The Structure of Atoms and Periodic Trends - 7-6 Periodic Trends and Chemical Properties - Applying Chemical Principles - Page 279: 2


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Work Step by Step

Y has a configuration $[Kr]\ 4d^1\ 5s^2$, La, $[Xe]\ 5d^1\ 6s^2$ and Lu, $[Xe]\ 4f^{14}\ 5d^1\ 6s^2$. Both have very similar electronic configurations, differing by the 4f subshell filled in Lu, but by definition La should be below Y since it has exactly the same configuration.
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