Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 14 - Problems - Page 610: 14.33


See explanation below.

Work Step by Step

The electron removed in Group 2A(2) atoms is from the outer level s orbital, whereas in Group 3A(13) atoms the electron is from the outer level p orbital. For example, the electron configuration for Be is 1s2s2 and for B is 1s2s2p1. It is easier to remove the p electron of B than the s electron of Be, because the energy of a p-orbital is slightly higher than that of the s orbital from the same level. Even though the atomic size decreases from increasing Zeff, the IE decreases from 2A(2) to 3A(13).
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