Answer
Copper.
Calcium.
Work Step by Step
Copper is the most dense with $8920\ kg/m^3$, and calcium is the least dense with $1550\ kg/m^3$.
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 - 1-8 Energy: Some Basic Principles - Case Study - Page 19: 3
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