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Francium has the largest atomic radius. Why might this be?

AThe highest number of protons for the least number of electrons and neutrons.
BThe highest number of energy levels and the least nuclear pull.
CThe lower ability to gain or lose electrons resulting in fewer ions forming.
DThe highest number of energy levels most nuclear pull.

Verified Answer :

The answer is B
Basically the atomic radius increases when the energy levels and the groups increase .Having the most nuclear pull creates a force of attraction that pulls the electrons closer to the nucleus , resulting in a smaller atomic radius.

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