Introductory Chemistry (5th Edition)

Published by Pearson
ISBN 10: 032191029X
ISBN 13: 978-0-32191-029-5

Chapter 9 - Electrons in Atoms and the Periodic Table - Exercises - Problems - Page 318: 45

Answer

The electron in 2s orbital is closer to the nucleus as compared to the electron in 3s orbital.

Work Step by Step

The principal shell is numbered as 1,2,3,4... with the shell with a lower number being closer to the nucleus. Due to this reason, the electron in 2s orbital are closer to the nucleus as compared to the electron in 3s orbital.
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