 Electronegativity is a measure of the ability of an atom or molecule to attract pairs of electrons in the context of a chemical bond.The type of bond formed is largely determined by the difference in electronegativity between the atoms involved, using the Pauling scale.Trend-wise, as one moves from left to right across a period in the periodic table, the electronegativity increases due to the stronger attraction that the atoms obtain as the nuclear charge increases.