Periodicity In Ionisation Enthalpy

Explain the following a) Electronegatively of elements increase on moving from left to right in the periodic table. b) Ionisation enthalpy decrease in a group from top to bottom.

Periodic Trend |Atomic Radii |Ionic Radii|Ionisation Enthalpy |Electron Gain Enthalpy|Electronegativity |OMR|Summary

Ionization Enthalpy|Successive Ionisative Enthalpies|Questions|Factors Affecting Ionisation Enthalpy|Nuclear Charge|Atomic Size|Penetration Effect Of The Electrons|Questions|Shlelding Or Screening Effect Of The Inner Shell Electrons|Electronic Configuration|Variation Of Ionisation Enthalpy In Period|Explanation|Variation Along Group|Summary

Ionization Enthalpy|Successive Ionisative Enthalpies|Questions|Factors Affecting Ionisation Enthalpy|Nuclear Charge|Atomic Size|Penetration Effect Of The Electrons|Questions|Shlelding Or Screening Effect Of The Inner Shell Electrons|Electronic Configuration|Variation Of Ionisation Enthalpy In Period|Explanation|Variation Along Group|Quiz|Summary

The correct order of Ionisation Enthalpy is -

The CORRECT order of first ionisation enthalpy is :

The trend in ionisation enthalpy of transition element is not regular because

Explain the trend in ionisation enthalpy with reference to group 16.