Question: Three elements have the electron configurations 1s 2 2s 2 2p 6 3s 2 , [Ar]4s 2 , and 1s 2 2s 2 2p 6

Three elements have the electron configurations 1s²2s²2p⁶3s², [Ar]4s², and 1s²2s²2p⁶3s²3p⁵. The atomic radii of these elements (not necessarily in the same order) are 99, 160, and 231 pm. Identify the elements from the electron confi gurations, and match the sizes with these elements.

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