Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Part 2 - Multiple-Choice Practice Exam: 3

Answer

One electron.

Work Step by Step

Sodium has 11 electrons. The first shell has two electrons, the second shell has eight, so the third shell must have just one. This is discussed on page 215.
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