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eletronegativity means attrection of electron by bonded atoms in shared condition for example there is HCl molecule where EN of chlorine is more then hydrogen so negative charge on chlorine atom.this besically depends upon effective nuclear charge,size of atom,bond dissociation energy,redius of atom mainly.electronegativity fector also given by diggerent scientest in different form .for example mulliken gives formula EN=I.P +EA/2.highest en element is F while inert gases with zero enegativity.we follow mainly pouling scale for electronegativity order is F>O>N>Cl>Br>S>C>H>Cs.you also consult my material at goiit site.
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