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There's also a periodic table with the elements and their electronegativity numbers, but I'm pretty sure Lavelle said we don't have to memorize the exact values. If we needed to know the precise numbers, it would be given to us.
You just have to know the trend of electronegativity on the periodic table and also the idea behind it - which is how easily an atom can attract a bonding pair of electrons. Ex: F needs only one more electron to reach a stable state so it's highly electronegative.
In the book the equation for electronegativity is given as the average of ionization energy and electron affinity. But in lecture Dr. Lavelle said we'd just be given the table of values if we need to use them on a test so we probably don't need the equation
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