Pls answer Q127:

127. Among the following elements (whose electronic configuration is given below ) the one having the highest ionisation energy is.
(1) [Ne] 3s2 3p3              (2)  [Ne] 3s2 3p4 
(3) [Ne] 3s2 3p5              (4) [Ar] 3d10 4s24p
 

Dear student

Option 1 is correct
Because here the last orbital is half filled and half filled orbitals are extra stable, thus having high ionisation energy.

Regarda

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