Answer
The stable element with the lowest ionization energy in the group is At.
Work Step by Step
Ionization energy decreases down groups, and At lies at the bottom of the group.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 4 - Section 4.7 - Trends in Periodic Properties - Challenge Questions - Page 131: 4.108d
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