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.
Tick the correct order of second ionization enthalpy in the following:

Options

A. `[Ne] 3 s^(2) 3p^(1)`
B. `[Ne] 3s^(2) 3p^(3)`
C. `[Ne] 3s^(2) 3p^(2)`
D. `[Ar] 3d^(10) 4s^(2) 4p^(3)`

Answer

B

Explanation

Both (b) and ( d) have similar exactly half- filled electronic configuration but the size of ( b) is smaller that that of ( d) .