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Which element has the largest radius?

Understand the Problem

The question is asking for the element on the periodic table that has the largest atomic radius. To answer this, we need to consider the trends in atomic radii within the periodic table, particularly that atomic radius increases down a group and decreases across a period from left to right.

Answer

Francium (Fr)

The final answer is Francium (Fr).

Answer for screen readers

The final answer is Francium (Fr).

More Information

Francium, an alkali metal with atomic number 87, has the largest atomic radius due to its single electron in the highest principal energy level, resulting in less effective nuclear charge and a larger atomic size.

Tips

A common mistake is confusing atomic radius trends within groups and periods; remember that atomic radius increases down a group and decreases across a period.

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