Answer
This is a reduction.
Work Step by Step
Reduction is gain of electron(s).
In this case, the electron is on the reactants side, therefore, the $Na^+$ is gaining this electron, to produce $Na(s)$.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 7 - Section 7.5 - Oxidation-Reduction Reactions - Questions and Problems - Page 235: 7.39a
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