Answer
2s
Work Step by Step
Because 2s shows an initial peak between $0 \dot{A}$ and $0.5 \dot{A}$ while 2p does not begin to increase until almost $0.5 \dot{A}$, 2s has greater electron density close to the nucleus.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 7 - Periodic Properties of the Elements - Additional Exercises - Page 294: 7.80a
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