Answer
Due to addition of atomic orbital
Work Step by Step
As we go down the group, no. of atomic orbitals increases, which increase the atomic radius
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 - Figure 4.13 - Page 122: 1
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