It doesn't. Francium has the largest atomic radius because it has the most energy levels in period seven of the Periodic Table, and the least number of protons.
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Indium has the largest atomic radius among elements in its period because of the shielding effect. With more electron shells, the outer electrons are further from the nucleus, resulting in a larger atomic radius.
The element with the largest atomic radius among boron, aluminum, gallium, and indium is indium. As you move down the group in the periodic table, atomic radius generally increases due to the addition of electron shells. Indium, being the lowest in this group, has the largest atomic radius.
The atomic radius of indium is about 1.56 angstroms, which is equivalent to 0.156 nanometers. This means that the size of an indium atom is on the order of tenths of a nanometer.
Fluorine has the smallest atomic radius, while Francium has the largest atomic radius.
Potassium has the largest atomic radius. It is in the 1st group of the periodic table. Fluorine has the least atomic radius.
Group-1 has largest atomic radius. It decreases across a period