Answer
Nitrogen
Work Step by Step
First ionization energy increases as we go up in a group due to smaller radius. Nitrogen is the first element of G-VA. Hence it has smallest first ionization energy in the group.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 5 - Electron Configurations and the Periodic Table - Questions for Review and Thought - Topical Questions - Page 240d: 104c
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