Out of the three isotopes of hydrogen which is more electronegitive and why ?

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Solution

Deuterium
Electronegativity can be defined as the ability of an atom’s nucleus to attract the electron cloud of neighboring atoms.

Now for Protium(1H1) it has one proton(+ve charged) & so it could attract the electrons effectively towards itself but in deutrium there is an added neutral charge in the form of a neutron which increases the size thus reduces the electronegativity tendency of the deutrium atom & similarly for tritium

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