Question

Which one will have the highest 2nd ionisation energy? a)1s2 2s2 2p6 3s1 b)1s2 2s2 2p4 c)1s2 2s2 2p6 d)1s2 2s2 2p6 3s2

Answer 1

Answer:

Answer:(d)

Explanation:

Answer 2

Answer: A) 1s2 2s2 2p6 3s1

Explanation: The element with electronic configuration 1s2 2s2 2p6 3s1 will have highest second ionization enthalpy. 1s2 2s2 2p6 3s1  loses one electron to form 1s2 2s2 2p6.  It is stable electronic configuration of noble gas Ne. Removal of second electron will require large amount of energy as it will break stable noble gas electronic configuration.

As we know inert gas have zero tendency to lose electrons from their valence shell electrons. And that's why it is also called as stable electronic configuration. So the removal of 2nd electron requires more energy but in case of 1s2 2s2 2p6 3s2 as the electron is in shell and it's state s1 so it is easy to remove 2nd electron in less amount of energy as compared to 2p6.

Hence, This is the required reason for 2nd highest ionisation energy of 1s2 2s2 2p6 3s1.

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