Question

Okay what does this mean?

ionic bonds will be formed more easily between elements with comparatively low ionisation enthalpies and elements with comparatively high negative value of electron gain enthalpy.

Answer 1

This means ionic bonds will be formed more easily between elements with low ionisation enthalpy (or energy required to remove an electron) and elements with high negative value of electron gain enthalpy (means elements that release more energy when an electron is added). Ask if you have any doubt

Answer 2

Answer:

first of all let’s see what ionisation energy and electron gain enthalpy means :

ionisation energy : energy required to remove an electron from an isolated neutral gaseous atom.

electron gain enthalpy : enthalpy change associated with the gaining of an electron in an isolated neutral gaseous atom.

low ionisation energy means lesser energy required for giving out electron.

that is, elements with low I.E tends to lose electrons easily (high electropositivity).

from my understanding, more negative electron gain enthalpy means more energy released when gaining electron. that is, elements with more negative electron gain enthalpy tends to gain electrons easily.

So, ionic bond will be formed more easily between elements with comparatively higher tendency to lose electron and higher tendency to gain electron.