# How many unpaired electrons are in a potassium atom?

For potassium, $Z = 19$...and using the usual electronic configuration scheme..we get...
$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{1}$