Answer:
francium
Step-by-step explanation:
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.
A. Potassium (K)
The trend of atomic radius goes:
As group number increases, radius decreases
As period number increases, radius increases
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