Answer
A
Work Step by Step
According to the period table, the fourth group's elements are: C (Period 2), Si, Ge, Sn, Pb, Fl.
The element at the third period is silicon.
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 - 2-5 The Periodic Table - Review & Check for Section 2-5 - Page 63: 2
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