Screening effect influencesA) atomic radiusB) ionisation enthalpyC) electron gain enthalpy

The screening effect, also known as the shielding effect, significantly influences:

A) Atomic Radius: The screening effect directly influences the atomic radius. As the number of electron shells increases, the outer electrons experience a lesser pull from the nucleus due to the screening effect of the inner shell electrons. This results in an increase in the atomic radius.

B) Ionisation Enthalpy: The screening effect also impacts the ionisation enthalpy. The greater the screening effect, the lesser the ionisation energy required to remove an electron from an atom. This is because the outermost electrons are shielded from the nucleus' pull, making it easier to remove them.

C) Electron Gain Enthalpy: The screening effect influences the electron gain enthalpy as well. If the screening effect is strong, the nucleus' pull on the incoming electron will be weaker, resulting in a lower electron gain enthalpy. Conversely, if the screening effect is weak, the nucleus will have a stronger pull on the incoming electron, resulting in a higher electron gain enthalpy.