1.

In the following, the element with the highest ionisation energy is

Answer»

`[Ne]3s^(2)3P^(1)`
`[Ne]3s^(2)3p^(3)`
`[Ne]3s^(2)3p^(2)`
`[Ne]3s^(2)3p^(4)`

Solution :Half-filled orbitals and FULLY filled orbitals are more stable and HENCE they have higher ionisation energies. So `[Ne] 3s^(2)3p^(3)`has the highest ionisation ENERGY.


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