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Which element has the largest atomic radius?
ChemistryAtomic Structure
Quick Answer
Francium is usually cited as having the largest atomic radius, though direct measurements are limited by its rarity and radioactivity. In practice, cesium is the nearest well-studied comparison.
The Full Story
Francium is expected to have the largest atomic radius because atomic size generally increases down a group in the periodic table. Since francium is at the bottom of Group 1, it should have the most extended electron cloud among the alkali metals. However, francium is highly radioactive and exists only in tiny amounts, so precise measurements are difficult. Cesium is often used as the practical comparison element in chemical discussions.
Key Facts
1.Francium is the theoretical largest
2.Cesium is the practical comparison
3.Atomic size increases down Group 1
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Suggested video title for this topic:
"The biggest atom on the periodic table"