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You do not need to know the values for electronegativity. However, you should know the trends for electronegativity which follows the same trends as ionization energy and electron affinity. This is reasonable because electronegativity is calculated based on the values of ionization energy and electron affinity. If the ionization energy and electron affinity of an atom is high, then the atom will have a high electronegativity which will cause it to pull shared electrons towards it.
If Lavelle does give us a question asking us to compare the electronegativity between two elements he will have to provide us a periodic table with the corresponding electronegativity values or the values in general
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