Answer
$$2-$$
Work Step by Step
Oxygen is located in Group 6A. Therefore it needs to gain two electrons in order to achieve a noble gas electron configuration. Thus it is expected to form a $2-$ charge.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 2 - Sections 2.1-2.9 - Exercises - Problems by Topic - Page 80: 59a
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