Answer
$Co^{3+}$, $F^-$
$CoF_3$
Work Step by Step
Cobalt (Co) III implies a $3+$ charge: $Co^{3+}$
Fluorine (F) is from group 7A, so it should gain one electron: $F^-$
The ionic compound formed by the two would be $CoF_3$.
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 2 Atoms, Molecules, and Ions - Study Questions - Page 95b: 42
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