3.2.4 Compare the relative electronegativity values of two or more elements based on their positions in the Periodic Table.

The most electronegativie element is on the top right of the Periodic Table and the least electronegative element is on the bottom left.

• Increases from left to right across a period because of increase in nuclear charge, resulting in an increased attraction between the nucleus and the bond electrons. 
• Electronegativity decreases down a group. The bond electrons are furthest from the nucleas and so there is reduced attraction. 

• Fluorine has the highest value of 4.0.
• Ceasium has the lowest value of 0.7.