Generally speaking, the electronegativity of elements in the periodic table increases gradually from left to right; The electronegativity of elements gradually decreases from top to bottom of the periodic table.
1. The electronegativity of elements changes periodically with the increase of atomic number.
2. In the same period, the electronegativity of elements increases from left to right, and the electronegativity of elements in the same main family decreases from top to bottom. For the sub group, the electronegativity of the elements of the same group also shows this trend. Therefore, the elements with high electronegativity are concentrated in the upper right corner of the periodic table, while the elements with low electronegativity are concentrated in the lower left corner.
3. The greater the electronegativity of non-metallic elements, the more active the non-metallic elements are, and the smaller the electronegativity of metal elements, the more active the metal elements are. Fluorine has the largest electronegativity (4, 0) and is the most active non-metallic element; Francium is the least electronegative element (0.7) and the most active metal element.
4. The electronegativity of transition elements has no obvious rule.