Скачать или смотреть Why Is Fluorine the Most Electronegative Element on the Periodic Table?

In this video, we look at why Fluorine is the most electronegative element. By looking at the periodic table, we can see a clear trend:

Electronegativity increases across a period (left to right)

Electronegativity increases up a group (bottom to top)

Fluorine sits at the top-right corner (excluding noble gases), so it has both of these trends working in its favor.

There are two main reasons for Fluorine’s extreme electronegativity:

1️⃣ Fluorine is a very small atom.
Its valence electrons are close to the nucleus, so the attraction between the nucleus and those electrons is strong. When Fluorine forms covalent bonds, the shared electrons are pulled closer to fluorine, increasing its ability to attract electrons in a bond.

2️⃣ Fluorine has a high nuclear charge.
Compared to other elements in its period (and even Hydrogen and Helium), Fluorine has more protons. That strong positive charge pulls on bonding electrons more effectively, making Fluorine even more electronegative.