Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 2 - Atoms, Molecules, and Ions - Review Questions: 7


Periods are the columns of the periodic table that go vertically. Families are the rows that go across.

Work Step by Step

By looking at the Periodic Table of Elements, an example of a period would be the row starting with Potassium and ending in Krypton. You can remember periods go across horizontally because a sentence goes across the page horizontally and you end sentences with a period. Family Trees go down vertically so Families go vertically on the periodic table.
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