Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 8 - Problems - Page 354: 8.18

Answer

See explanation below.

Work Step by Step

Same group have similar outer electron configurations, beacuse the outermost shell has equal no of electrons. Within a period, outer electron configuration changes with each element because each has an different electron in the outermost shell.
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