Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 5 - Electron Configurations and the Periodic Table - Questions for Review and Thought - Topical Questions - Page 240b,: 49

Answer

There are 18 elements in fourth period of the periodic table. According to the Quantum theory, the maximum number of electrons in the third shell can be: 2 electrons in 4s subshell 6 electrons in 4p subshell 10 electrons in 3d subshell Total 18 electrons, hence a maximum of 18 elements in fourth period

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