Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 7 - Section 7.1 - Development of the Periodic Table - Checkpoint - Page 286: 7.1.3

Answer

(c) iii only.

Work Step by Step

(i) It is probably solid at room temperature, following the pattern of the similar elements. (ii) It needs just one electron to achieve stability, so it is probably very reactive. (iii) At is in the same column of element 117. (iv) Ra is not in the same column of element 117.
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