Answer
The first ionization energy tends to increase from left to right across a period and decrease from top to bottom within a group.
Work Step by Step
Read the bold in the first paragraph under "Trends in Ionization Energy".
Chemistry (12th Edition)
by Wilbraham
Published by
Prentice Hall
ISBN 10:
0132525763
ISBN 13:
978-0-13252-576-3
Chapter 6 - The Periodic Table - 6.3 Periodic Trends - 6.3 Lesson Check - Page 182: 20
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