Which of the following is not considered as a fixed quantity?

Electronegativity

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First ionisation potential

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Electron affinity

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Second ionisation potential

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Solution

The correct option is A Electronegativity
Electronegativity of an atom is not a fixed quantity as the actual electron attracting power of an atom depends on its environment. Electronegativity of an atom is a mean value for the element in its most common oxidation state. The higher the charge of an atom the greater will be the electronegativity of an element.

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X^{+} Y^{-}

(IE = Ionisation energy in eV/atom, EA = Electron affinity in eV/atom, EN = Electronegativity in Mulliken scale)

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