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Elements with their electronic configura...

Elements with their electronic configuration are given below:
Answer the following questions: ltbr. I: `1s^(2)2s^(2)`
II: `1s^(2) 2s^(2) 2p^(6)`
III: `1s^(2) 2s^(2) 2p^(6)3s^(2)`
IV `1s^(2)2s^(2)2p^(3)`
V: `1s^(2)2s^(2)2p^(5)`
Q. The element with lowest electron gain enthalpy is:

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