Question

where do you find the atoms with the largest atomic radius

Answer 1

Atoms with the largest atomic radii are typically found at the bottom left of the periodic table. As you move down a group (column), the atomic radius increases due to the addition of electron shells, which increases the distance between the nucleus and the outermost electrons. Additionally, as you move from right to left across a period (row), the atomic radius also increases because the effective nuclear charge experienced by the outermost electrons decreases, allowing the electrons to be held less tightly.

For example, cesium (Cs) and francium (Fr) are elements found in Group 1 (the alkali metals) and have some of the largest atomic radii among the elements. Francium is particularly noted for having one of the largest atomic radii, although it is rare and highly radioactive.