Answer
Helium and neon.
Work Step by Step
Helium and neon have lower densities than air.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 1 Basic Concepts of Chemistry - Study Questions - Page 21c: 43
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