Question

What is electro negativity

Answer 1

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

The Pauling scale is the most commonly used. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to caesium and francium which are the least electronegative at 0.7.

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Answer 2

electronegativity is the tendency of an atom to attract electrons towards itself 
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the reason for this attraction may be to attain stability or to obtain octet

fluorine is the most electronegative atom in the periodic table 
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some of the highly electro negative atoms are chlorine , iodine etc