Which of the following atom has the lowest ionization enthalpy?

1.	Which of the following atom has the lowest ionization enthalpy?
Answer» `1s^(2)2s^(2)2P^(3)` `1s^(2)2s^(2)2p^(6)3S^(1)` `1s^(2)2s^(2)2p^(6)` `1s^(2)2s^(2)2p^(5)` ANSWER :b

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