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I believe this is due to the fact that with increasing molar mass and atomic size comes with an increase in electrons. With the increase in electrons, the atom has a higher interaction potential energy. Also, polarizability , which is the measure of the ability for anions to form dipoles or to be distorted in their electron clouds, needs to be considered since polarizability is proportional to interaction energy. Because larger atoms tend to have higher polarizability, those atoms will also have higher interaction energies. Hope this helps.
From my understanding, the larger the atom, the less electronegative it is because the electrons are farther away from the attractive force of the positive nucleus. Therefor, the nucleus isn't able to pull new electrons in with as much force as, say, Fluorine.
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