Configuration that shows the highest energy released when an electron

1.	Configuration that shows the highest energy released when an electron is added to the atom
Answer» `1s^2 2s^2 2p^3` `1s^2 2s^2 2p^4` `1s^2 2s^2 2p^5` `1s^2 2s^2 2p^6` ANSWER :C

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