If the difference in electronegativities of two elements is very large,then

The correct order of electronegativity of group $13$ elements is

Define electronegativity. How does it differ from electron gain enthalpy?

Arrange the following elements in the decreasing order of their electronegativity values.

Given that the ionization potential and electron gain enthalpy of chlorine are $13 \ eV$ and $4 \ eV$ respectively. The electronegativity of chlorine on the Mulliken scale is approximately equal to: (in $eV$)

Assertion $:$ Electronegativity of $Al$ is greater than $Tl$.
Reason $:$ In a Boron family,down the group regularly size increases.