Name two elements that have large radius?

Which elements have a larger atomic radius?

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

Explanation:

the energy to form plasma comes from heat or electricity in the atmosphere!

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answer carbon and three oxygen atoms;