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Consider the ground state electronic con...

Consider the ground state electronic configurations given below and answer the following.
`A : 1s^2 2s^2 2p^5` ,`B : 1s^2 2s^2 2p^4` , `C : 1s^2 2s^1`, `D : 1s^2 2s^2 2p^6 3s^1`, `E : 1s^2 2s^2 2p^6`
Which of the above configuration is associated with highest and which is with lowest ionisation enthalpy?

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