Trends in Electron Gain Enthalpy

Chemistry

example

Electron gain enthalpy

The electron affinity increases across a period while it decreases down a group. 
The zero group elements have the lowest electron affinity values. Halogens posses highest electron affinity in the periodic table. In halogens chlorine posses highest electron affinity in the periodic table.

example

Electron affinity

The energy released when an electron is added to a neutral gaseous atom is known as electron affinity. The unit for electron affinity is kilo joules per mole. 
It depends mainly on two factors. They are atomic size and nuclear charge.

example

Trend in electron gain enthalpy

The electron affinity increases across a period while it decreases down a group. 
The zero group elements have the lowest electron affinity values. 

definition

Electron Affinity

The amount of energy released when an atom in the gaseous state accepts an electron to form an anion. Factors which affect electron affinity are: Atomic size and Nuclear charge. As atomic radii increases, electron affinity increases. As nuclear charge increases, electron affinity increases. It decreases down a group and increases across a period.

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