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Generally, the smaller the atomic radius, the higher the electronegativity. So as you go right on the periodic table, atomic radius decreases and electronegativity increases. As you go down, atomic radius increases and electronegativity decreases. This is because the nucleus has a stronger hold on the electrons and therefore the atom is more likely to gain an electron. However, noble gases have very low electronegativity as they are already stable because of their full shell.
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