Answer
Please see the work below.
Work Step by Step
There is only one electron in the 1s orbital of hydrogen. Hence there is no chance of screening effect. So the outer orbitals experience the nuclear attraction and hence have the same energy.
Chemistry 12th Edition
by Chang, Raymond; Goldsby, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0078021510
ISBN 13:
978-0-07802-151-0
Chapter 7 - Quantum Theory and the Electronic Structure of Atoms - Questions & Problems - Page 317: 7.68
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