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Electronegativity increases as you go across a period from left to right. Across the periodic table elements increase in the number of electrons in their outer energy level. As the number of electrons in an elements outer energy level nears a full octet (8) it gets increasingly difficult to remove an electron. Noble gases do not have an electronegativity value because they do not readily form compounds.
Electronegativity decreases as you go down a group or family. Inner energy level electrons block the attraction between the positively charged nucleus and the electrons in the outer energy level. This shielding effect makes it easier to remove a valence electron as the number of energy levels increases.

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