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There are 32 elements in the seventh period, with 14 of them being known as actinides, and they are known for their radioactivity (Uranium and Plutonium are in this period).
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95b: 28
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