Select which periodic property is not regular in halogen family moving down thegroup?

Select which periodic property is not regular in halogen family moving down the group? I) Ionisation energy ll) Electron gain enthalpy III) Size IV) Eletronegativity

In case of hydride of oxyge family, which of the following physical property change regularly on moving down the group

Which of the following properties show a reverse trend in moving down the group of alkali and alkaline earth metals?

Select the correct order of periodic properties of species :

Which one of the following is not a periodic property i.e. does not show any trend on moving from one side to the other in the periodic table ?

What are the similarities in properties of elements in halogen family?

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. Which of the following isoelectronic ions has the lowest first ionization enthalpy?