Final answer:
Fluorine (F) has the highest electronegativity among the provided options with a value of 4.0 on the Pauling scale, indicating its strong ability to attract electrons compared to other elements.
Step-by-step explanation:
The element with the greatest electronegativity among the options provided is fluorine (F). Electronegativity is the measure of the tendency of an atom to attract a bonding pair of electrons. Fluorine has the highest electronegativity value on the Pauling scale at 4.0, indicating a strong ability to attract electrons in a chemical bond. Conversely, cesium (Cs) has the lowest electronegativity value among the nonradioactive elements, which is 0.79. In the context of the periodic table, electronegativity increases diagonally from the lower left to the upper right, hence elements like F, located in the upper right, have higher electronegativity compared to elements like Li, H, He, and Cs, which are either towards the left side or bottom of the periodic table.