by 
Anonymous
ANSWERS: 3
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The easiest way is to look it up. Though as a rough guide, the further down it is and the furthre to the left, the weaker the electronegativity.
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The more protons an element has, the more electronegative it is, because they have a higher nuclear charge, which increases their power to attract electrons in a covalent bond.
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Linus Pauling formulated an empirical scale ( form Li =1.0 to F = 4.0) which was based on the difference between the dissociation energy of a bond between two different atoms ( say A and B bond A-B ) and the geometric mean of the dissociation energies of A-A and B-B Mulliken used a different empirical scale calculated on mean of ionization energy and electron affinity. We never have to calculate these values- they are done for us - we use the difference in values to predict bond polarity etc.
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