Answer
Please see the work below.
Work Step by Step
We know that the highest value of n is six, so thallium (Tl) lies in the sixth period. 5d sub shell is filled and 6p electron. Thus Tl belongs to group IIIA and a main group element.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 8 - Electron Configurations and Periodicity - Questions and Problems - Page 331: 8.55
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