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Electronegativity increases as you go up the periodic table as the energy level is lower so electrons are held closer to the nucleus with lower atomic radii and an increased effective nuclear charge. As you go across the periodic table electronegativity also increases as the energy level remains the same but atoms increase in atomic number and the increased number of protons also increases effective nuclear charge pulling electrons tighter increasing electronegativity. As effective nuclear charge increases so does electronegativity.
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