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The noble gases have outer electron shells that are completely full. Therefore, they do

do not form ordinary compounds and a different method has to be used to define their electronegativity.

Electronegativity for noble gases have been determined using the Allred-Rochow scales. Their values are :

He=5.50, Ne=4.84, Ar=3.20, Kr=2.94, Xe=2.40.

The Mulliken-Jaffe scale lists their electronegativities as:

He=3.49, Ne=3.98, Ar=3.19, Kr=3.00, Xe=2.73, Rn=2.59 (F=3.91, H=2.25).

The Allen electronegativity scale (Spectroscopic electronegativity scale) lists the EN of noble gases as

He=4.16, Ne=4.79, Ar=3.24, Kr=2.97, Xe=2.58 (F: 4.19, H: 2.30).

The modern high level ab initio calculations indicate that neon is surprisingly less reactive than helium. The reactivity order is Ne < He < Ar < Kr < Xe < Rn

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