# How do you order the elements K, Cs, and P in increasing electronegativity?

$\ldots . . C s , \ldots K , \ldots \ldots \ldots \ldots \ldots \ldots \ldots P$
$\stackrel{\rightarrow}{\text{increasing electronegativity}}$
And so we gots 2 alkali metals, $\text{Group 1}$. Caesium is $\text{Period 6}$, and should be LESS electronegative than potassium, $\text{Period 4}$. On the other hand, phosphorus, $\text{Period 3}$, $\text{Group 15}$, has greater unshielded nuclear charge, and thus should be more electronegative.