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Electro negativity is the tendency of elements to attract electrons. They form negative the negative ions when the combine with other elements. Like NaCl has a Na+ and a Cl- ion.
As we move down along a column in the periodic table the electro negativity decreases. This implies that as the size of the atom increases the electro negativity decreases. It can be attributed to the fact that the positive charge in the nucleus is shielded by more electrons.
As we move from the left to the right across a row the electro negativity increases. So elements like fluorine, chlorine, etc which lie at the extreme right, just before the noble gases are the most electronegative.
Fluorine is the most electronegative element.
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