Answer
$K\lt Li\lt C\lt N$
Work Step by Step
Ionization energy increases from left to right and decreases with period.
Li (1), C(14) and N(15) are in period 2, and K is in period 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 7 The Structure of Atoms and Periodic Trends - Study Questions - Page 281a: 28
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