Chemistry 12th Edition

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 318: 7.87

Answer

Please see the work below.

Work Step by Step

The atomic number of Selenium is 34. Its electronic configuration is $[Ar]4s^{2}3d^{10}4p^{4}$. According to the Aufbau principle, the orbitals with lower energy are filled first. The energy of the orbitals is $4s\lt3d\lt4p$.
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