The outermost electronic configuration o...

The outermost electronic configuration of the most electronegative element is

`ns^(2) np^(3)`

`ns^(2) np^(4)`

`ns^(2) np^(5)`

`ns^(2) np^(6)`

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The properties of the elements (atomic/ionic radii, electron gain enthalpy, ionization enthalpy, electronegativity, valence, oxidising/reducing power, acid/base character, etc.) which are directly or indirectly related to their electronic configirations are called periodic properties. These properties show a regular gradation on moving from left to right in a period or form top to bottom in a group. Down a group, the atomic/ionic radii, metallic character and reducing character increase while ionization enthalpy and electronegativity decrease. Along a period from left to right, atomic/ionic and metallic character decrease while ionization enthaloy, electronegativity, non-metallic character and oxiding power increase. However, electron gain enthalpy becomes less negative down a group butmore negative along a period. In contrast, inert gases have positive electron gain enthalpies which do not show may regular trend. The outermost electronic configuration of the most electronegative elements is:

`ns^(2)np^(3)`

`ns^(2)np^(4)`

`ns^(2)np^(5)`

`ns^(2)np^(6)`

`ns^(2)np^(2)`

`ns^(2)np^(4)`

`ns^(2)np^(5)`

`ns^(2)np^(6)`

`1s^2,2s^22p^5`

`1s^2,2s^22p^4,3s^1`

`1s^2,2s^2 2p^5,3s^1 3p^1`

`1s^2,2s^2 2p^6,3s^2 3p^5`