Answer
The $Ca$ atom loses electrons in the reaction.
Work Step by Step
In the reaction, the $Ca$ atom loses 2 valence electrons to 2 $F$ atoms so that it could reach an octet.
That means the $Ca$ atom loses electrons in the reaction.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 8 - Basic Concepts of Chemical Bonding - Exercises - Page 334: 8.16d
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