Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 2 Atoms, Molecules, and Ions - 2-2 Atomic Number and Atomic Mass - Review & Check for Section 2-2: 2

Answer

C

Work Step by Step

Mass number $A=23$ Number of neutrons: $n^0=12$ Number of protons: $A=p^++n^0\rightarrow p^+=Z=11$ From the periodic table, that atom is sodium (Na).
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