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Electronegativity is the ability of an atom to attract shared electrons toward itself. Electronegativity generally decreases down a group because there is more distance between the nucleus and the outer valence shell and increases across a period because the charge on the nucleus increases due to the increasing number of protons. Electronegativity relates to ionization energy and electron affinity.
Electronegativity does follow the same trend as ionization energy and electron affinity. Make sure to remember that there are a few exceptions to the ionization energy trend, but other than that these three properties all share the same trend (increasing across the period and decreasing down a group).
I know that the trend of electronegativity increases as you go up and to the right, however, in the case of oxygen and chlorine which one has a higher electronegativity and what aspect of that element makes it so?
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