Answer:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
The He or helium is a smallest element and the Fr or the francium is largest.
The atomic radius is a chemical element and is a measure of the atomic size. It typical distance from the center of the nucleus is bounded by the electron shells.
The atomic radii can vary on basis of the periodic table. Hence can be seen as the radius increases from top to the bottom in a group, and then decreases from left to the right across a period.
Find out more information about the atomic radius.
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