Factors affecting electron gain
The magnitude of electron gain
enthalpy depends on a number of factors such as:
(i) Size of the atom:
Smaller the size of the atom, stronger is the attraction for the added electron
towards nucleus. Thus, smaller the size of atom, greater is the electron gain
(ii) Nuclear charge:
Greater the nuclear charge,
Stronger is the attraction for
the added electron towards nucleus. Thus, electron gain enthalpy increases as nuclear
configuration: The elements having stable configuration (half filled or
fully filled valence subshells) have very little or no tendency to accept additional
electron; hence, electron gain enthalpies are low or zero in these cases.
Variation of electron gain
enthalpies in periodic table: In general, the electron gain enthalpy becomes
less negative in going from top to bottom in a group and more negative inning
from left to right in a period.
However, electron gain enthalpy
does not show a regular trend along a period or a group.
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