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I’m not positive, but I think that electronegativity increases down a row and decreases down a group with no exceptions. Of course, the last group (noble gases) do not have electronegativity values since they have a stable configuration.
Yes, the above statement is correct regarding the electronegativity trend. The noble gases, with the exceptions of Xe and Kr that sometimes bond with fluorine and highly reactive elements, do not have electronegativity values. Those two exceptions are not of much importance though.
fluorine is the most electronegative atom since it is in the top right corner of the periodic table. just remember that electronegativity is how badly an atom wants another electron, so those closest to a full octet will be more electronegative. In addition, the smaller the atom is (the higher up in a column) the more electronegative it is since that insinuates a stronger pull from the nucleus. one exception is noble gases who, though are on the right side of the table, do not want another electron since they have a full octet already and are stable.
In the periodic table electronegativity generally follows the trend of increasing left to right. However, this trend does not include the noble gases and fluorine has the highest electronegativity instead of Ne or He.
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