Which amongst the following elements has the largest atomic size?

Beryllium

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Carbon

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Oxygen

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Fluorine

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Solution

The correct option is A Beryllium
The atomic size of an atom is the distance between the nucleus and the outermost shell of an atom. Atomic size reduces across a period from left to right. Beryllium, carbon, oxygen and fluorine belong to second period. Since beryllium is placed at the leftmost side of the period, therefore it has the largest atomic size.

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