Answer
The lettered group number of a main-group element is equal to the number of valence electrons for that element.
Work Step by Step
For example, all the elements of group number 1A has 1 valence electron.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 8 - Sections 8.1-8.9 - Exercises - Review Questions - Page 374: 20
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