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 - Questions - Page 280: 4


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Work Step by Step

a) f subshells, where the electrons are added in lanthanides, is not efficient at shielding the electrons from the outer s subshell from nucleus attraction, hence an increase in the atomic number translates into an increase in the effective nuclear charge and a decrease in radius from left to right among lanthanides. b) Since radius' increase with period number, it argues for the placement of La below Y.
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