Answer
Please see the work below.
Work Step by Step
For $Z=19$, we know that 4s electron is unpaired and it causes the ground state of the potassium atom to be a paramagnetic substance.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 8 - Electron Configurations and Periodicity - Questions and Problems - Page 331: 8.59
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