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Electronegativity is
the ability of an atom in a chemical compound to attract a bond pair of
electrons towards itself. The electronegativity of any given element is not
constant. It varies according to the element to which it is bonded. It is not a
measurable quantity. It is only a relative number.
On the other hand, electron gain enthalpy is the enthalpy change
that takes place when an electron is added to a neutral gaseous atom to form an
anion. It can be negative or positive depending upon whether the electron is
added or removed. An element has a constant value of the electron gain enthalpy
that can be measured experimentally.
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