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Hi, to answer your question, electronegativity determines whether an element is considered an electrophile. Usually the elements with high electronegativity (i.e. Br, I, F) are considered electrophiles since they have a high tendency to accept electrons. Since they all have 7 electrons in their outer valence electron shell, all they need to do is accept one electron to reach a balanced state of 8 electrons. Therefore, they have a high likelihood of accepting electrons. In other words, electrophiles are "electron lovers". They love to accept electrons in order to reach that balanced state. Usually they are the elements at the second to farthest right column of the periodic table. Noble gases have already reached the balanced state so they are unwilling to accept electrons and leave their most stable state. Therefore they have no electronegativity and cannot be considered electrophiles.
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