Which of the following alkali metals has the biggest atomic radius? Group of answer choicesRubidiumSodiumCesiumPostassium PreviousNext

The alkali metal with the biggest atomic radius is Cesium.

Here's why:

The atomic radius of an element tends to increase as you move down a group on the periodic table. This is because with each row, there is an additional electron shell around the nucleus, which increases the size of the atom.

The alkali metals are found in Group 1 of the periodic table. From top to bottom, the order is: Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium.

Therefore, among the options given (Rubidium, Sodium, Cesium, Potassium), Cesium has the biggest atomic radius.