"The ability of an atom to attract the shared pair of electrons towards itself in a molecule is called electronegativity"
The trend of electronegativity is same as ionization energy and electron affinity
electronegativity Increases in period - It increases from left to right in period due to increase in nuclear charge which decrease the distance from nucleus.
Electronegativity Increases in periods
Electronegativity decrease in group - because size of Atom increases and attraction for shared electron pair decreases
