Which element has chemical properties that are most similar to potassium?

(Li) Lithium

Explanation:

(Li) lithium and K potassium both belong to first group (alkali metals) and thus have similar chemical properties.

cesium, if it's that multiple-choice question with calcium nitrogen and sulfur as the other options

football

explanation:

because it is

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.