Electronegativity decreases because the valence electrons are farther from the nucleus.
Electronegativity DECREASES going down a group.
From left to right and into the upper corner of the periodic table electronegativity increases. Fluorine is the most electronegative element, but the elements in group 18 generally have no electronegativity at all.
Electronegativity generally decreases as you go down a group on the periodic table due to the increasing distance between the nucleus and valence electrons, reducing the attractive force. Across a period, electronegativity generally increases due to the increasing nuclear charge, pulling valence electrons closer and increasing their attraction.
From left to right and into the upper corner of the periodic table electronegativity increases. Fluorine is the most electronegative element, but the elements in group 18 generally have no electronegativity at all.
Going Up
Electronegativity decreases as you go down a group in the periodic table. This is because as you move down a group, the atomic radius increases, leading to a decrease in the attraction between the nucleus and the outer electrons, resulting in lower electronegativity values.
Electronegativity increases across (left to right) the periodic table and decreases on going down.
Electronegativity is not found on the Periodic Table of the Elements.
Electronegativity and first ionization energy both increase going up the Periodic Table.
Electronegativity is highest in the top right corner of the periodic table, with fluorine being the most electronegative element. Electronegativity decreases as you move down and to the left on the periodic table.
electronegativity
Fluorine