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Electronegativity is the ability of the atom to attract electrons into its orbital. For example, fluorine is the most electronegative element because it wants to reach the stable configuration of neon. Ionization energy is the amount of energy necessary to remove an electron from an atom. The two are proportional to each other; as electronegativity increases so does the ionization energy.
Ionization Energy is the amount of energy that an isolated atom in a ground state must have in order to discharge an electron! This is seen in our in class notes when we drew the picture of the metal and the equation En - ϕ = Ek where ϕ is the Energy that is needed in order to eject the electron so that Ek must be greater then or equal to ϕ.
I visualize ionization energy is having a struggle with an atom to pull one of its electron away from it, where electronegativity is an atom pulling my own electrons away when we are linking up (if the other atom has a higher electronegativity).
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