Which of thefollowingconfiguration representsatom of theelement havingthe highestsecondionizationpotential ?

Which of thefollowingconfiguration representsatom of theelement having

1.	Which of thefollowingconfiguration representsatom of theelement havingthe highestsecondionizationpotential ?
Answer» ` 1s^(2)2 s^(2)2p^(4)` `1 s^(2)2S^(2)2p^(6)` `1 s^(2)2s^(2)2p^(6)3S^(1)` `1s^(2)2s^(2)2p^(6)3s^(2)` Solution :Element whichhas oneelectron in thevalenceshellhas highestsecondionizationenergybecause inthiscase 2ndelectronhas to belost FROMTHE INERTGAS core . Thusoption ( c) iscorrect.