The correct order of increasing electron affinity of the following elements is

Electron gain enthalpy values $(\Delta_{eg} H)$ (in $kJ \ mol^{-1}$) of elements $X$,$Y$ and $Z$ are $-349$,$-200$ and $-295$ respectively. $X$,$Y$ and $Z$ are respectively

Which of the following represents the correct order of electron gain enthalpy (electron affinity) for halogens?

The electron affinity values of elements $A, B, C$ and $D$ are respectively $-135, -60, -200$ and $-348 \ kJ \ mol^{-1}$. The outer electronic configuration of element $B$ is

Explain the periodicity of electron gain enthalpy of elements in the periodic table.

The correct order of electron gain enthalpy is