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The atomic radii of members of the Group 1A (Alkali metals), increases down the group. Therefore Francium has the largest atomic radius of the Alkali metals.

However Fr has no stable isotopes, thus is not naturally occurring. So Cs-133 is the largest you can find.

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13y ago

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Look for a reference chart in a book or online. Look for a Periodic Table of the Elements that has the atomic radii on it.


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