Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 28 - Quantum Mechanics of Atoms - Questions - Page 825: 18

Answer

They are both in the same column of the periodic table (column I).

Work Step by Step

Their outer electron configurations are $s^{1}$, i.e., they have 1 electron in their outer s shell. They are alkali metals, which have a lone electron in an outermost shell. They want to share this electron with other atoms. Their chemical properties are therefore similar.
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