# Chapter 8 - Sections 8.1-8.9 - Exercises - Problems by Topic - Page 376: 59a

+1

#### Work Step by Step

$K:[Ar]4s^{1}$ The atomic number for argon is 18, which means there are $S=18$ electrons. $Z_{eff}$$=$$Z-S$$=19-18$$=+1$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.