Electronegativity vs Atomic Number
The graph of Electronegativity vs Atomic Number shows the trend in the electronegativity as one proceeds through the first 37 elements in the periodic table.
Within the same period or series, the electronegativity generally increases as you move from the alkali metal to the noble gas. This trend results from the same two factors that determine atomic radius. As the nuclear charge increases and the atomic radius decreases the increased attraction makes it easier for the atom to attract the electron.
Within the same group or family, the electronegativity decreases as you go down the group. Although there is an increase in nuclear charge, adding another principal energy level is the predominant factor. The addition of another principal energy level results in the electron being further from the nucleus and the decreased attraction makes it more difficult for the atom to attract the electron.
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