Elements having high ionization potential have low or high electronegativity

Dear student,
Ionisation enthalpy is defined as the amount of energy required to remove the most loosely bound electron from an isolated atom in the gaseous state of an element so as to convert it into gaseous monovalent positive ion.

High ionisation enthalpy indicates that the electrostatic attraction between the nucleus and the outermost electron is greater which makes the removal of electron difficult

As we move from left to right across a period, ionisation energy of elements increases. This is due to the decrease in size of atoms across a period. The valence electrons get closer to the nucleus of an atom as we move from left to right due to increased nuclear charge. The force of attraction between the nucleus and the electrons increases and hence more energy is required to remove an electron from the valence shell.

Hence Elements having high ionisation enthalpy will have high electronegativity ,because more energy will be required to remove an electron.

Hope this information will clear your doubts about topic.

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