Chemistry: The Molecular Science (5th Edition)

by Moore, John W.; Stanitski, Conrad L.

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 240c: 82

Answer

$ Rb+ \gt Ca 2+ \gt Mg 2+ \gt Be 2+$

Work Step by Step

We see that these ions all have the electron configuration of a noble gas. After seeing this, we must realize that the size of an atom increases as you move down the periodic table. We use this information to order the elements as follows: $ Rb+ \gt Ca 2+ \gt Mg 2+ \gt Be 2+$

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