Fluorine is the most electronegative element. Other highly electronegative elements are oxygen and chlorine. The element hydrogen does not have as high of electronegativity because, although it has a half-filled shell, it readily loses an electron rather than gains one.

Oxygen can form multiple bonds with metals, while fluorine can’t form multiple bonds with metals. Hence, oxygen has more ability to stabilize higher oxidation state rather than fluorine.

And thus across a Period (from RIGHT to LEFT as we face the Table), fluorine is more electronegative than oxygen , which is more electronegative than nitrogen , which is more electronegative than carbon , which is more electronegative than boron .

Electronegativity of Fluorine Fluorine is the most electronegative element because it has 5 electrons in it’s 2P shell. The optimal electron configuration of the 2P orbital contains 6 electrons, so since Fluorine is so close to ideal electron configuration, the electrons are held very tightly to the nucleus.

Bromine (and the other halogens) are all more electronegative than hydrogen, and so all the hydrogen halides have polar bonds with the hydrogen end slightly positive and the halogen end slightly negative.

As along the period, from left to right, the no. of electrons increase in shells, the power/attraction of the nucleus also increases, making each element more electronegative than the previous one. From all this, we conclude that Nitrogen is more electronegative than carbon.

Explanation: the 1st reason is that in the periodic table from left to right the electronegativity decreases. the 2nd reason is aluminium is a metal and phosphorus is a non metal.so we know metals are electopositive in nature and non metals are electronegative in nature.