Chemistry (7th Edition)

Published by Pearson
ISBN 10: 0321943171
ISBN 13: 978-0-32194-317-0

Chapter 6 - Ionic Compounds: Periodic Trends and Bonding Theory - Conceptual Problems - Page 218: 23


Red, green then blue

Work Step by Step

The most certain answer is red because it is the furthest to the left and thus it has the least ionization energy. It is debatable whether the halogen is harder to remove or the element above a period is harder to remove. The estimate was that the element a period above would have a lower ionization energy since its electron would have less $Z_{eff}$
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