Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 2 - 2.2 - Concept Check: 4

Answer

The elements that are in the same row are known to all have the same number of electron shells. Elements that are in the same column are ones that have the same number of electrons in their valence shells.

Work Step by Step

That is all elements in the first row of the periodic table (H and He) are the elements that have a valence electron shell in the first orbital. Hydrogen and Lithium are in the same column. As you can see, hydrogen and lithium both have one electron in their valence shell.
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