Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 7 - Periodic Properties of the Elements - Exercises - Page 291: 7.8b



Work Step by Step

If $X$ were a metal it would lose one electron to each of the four $F$ atoms when forming a compou.nd. This would greatly reduce the atomic radii of $X$. In the diagram $X$ and $F$ appear to have about the same atomic radii so x is not a metal.
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