Electron gain enthalpy depends on?
Electron gain enthalpy depends on?
The correct options are
A
Atomic size
B
Effective Nuclear charge
C
Screening or shielding effect
D
Stability of half filled and completely filled orbitals.
In general, electron gain enthalpy value becomes reduces with the increasing atomic radius because the electrostatic force of attraction decreases between the electron being added and the atomic nucleus due to an increase in the distance between them.
Electron gain enthalpy α 1Atomic size
Electron gain enthalpy value of the element increases as the effective nuclear charge on the atomic nucleus increases because the electrostatic force of attraction between the electron being added and the nucleus increases.
As the electrostatic force of attraction increases, the amount of energy released is more.
Electron gain enthalpy α Effective nuclear charge (−ve value)
(c) Screening or Shielding Effect: Electron gain enthalpy value of the elements becomes less negative with the increasing shielding or screening effect. The shielding effect between the outer electrons and the nucleus increases as the number of electrons increases in the inner shells
Electron gain enthalpy α 1Shielding effect (−ve value)
(d) Stability of half-filled and completely filled orbitals: The stability of half-filled and completely filled degenerate orbitals of a subshell is comparatively more, so it is difficult to add an electron in such orbitals and lesser energy is released with the addition of an electron. Hence the electron gain enthalpy (-ve value) will decrease.
A
Atomic size
B
Effective Nuclear charge
C
Screening or shielding effect
D
Stability of half filled and completely filled orbitals.
In general, electron gain enthalpy value becomes reduces with the increasing atomic radius because the electrostatic force of attraction decreases between the electron being added and the atomic nucleus due to an increase in the distance between them.
Electron gain enthalpy α 1Atomic size
Electron gain enthalpy value of the element increases as the effective nuclear charge on the atomic nucleus increases because the electrostatic force of attraction between the electron being added and the nucleus increases.
As the electrostatic force of attraction increases, the amount of energy released is more.
Electron gain enthalpy α Effective nuclear charge (−ve value)
(c) Screening or Shielding Effect: Electron gain enthalpy value of the elements becomes less negative with the increasing shielding or screening effect. The shielding effect between the outer electrons and the nucleus increases as the number of electrons increases in the inner shells
Electron gain enthalpy α 1Shielding effect (−ve value)
(d) Stability of half-filled and completely filled orbitals: The stability of half-filled and completely filled degenerate orbitals of a subshell is comparatively more, so it is difficult to add an electron in such orbitals and lesser energy is released with the addition of an electron. Hence the electron gain enthalpy (-ve value) will decrease.
