Question

Question #cc053

Answer 1

Same electronegativity.

Explanation:

Polar covalent bond forms between two elements of different electronegativity because the more electronegative element will pull toward it the electrons shared by the less electronegative element to form the bond.

Example:
if we consider the bond between hydrogen and fluorine in the hydrofluoric acid `H-F`. Fluorine is more electronegative than hydrogen, and it will pull the electron of hydrogen toward it resulting in creating a partial positive charge on hydrogen and it will acquire a partial negative charge; therefore, forming a polar bond.

`""^(+delta)H-F^(delta-)`

However, when two same elements form bonding, their electronegativity is equal and therefore, there is no pulling of electrons to any of the sides.

Example:

`H-H` or `F-F`