GEOLOGY

Detailed explanation-1: -Electronegativity is the tendency of an atom to attract a shared pair of an electron towards itself. It has no units simple it is a tendency. The covalent bond formed between two atoms in molecules whose electronegative difference exists is known as a polar covalent bond.

Detailed explanation-2: -In general the electronegativity difference must be 0.5 or more before the bond is labeled as a polar covalent bond instead of nonpolar covalent bond.

Detailed explanation-3: -An O-O bond is covalent, since the electrons are shared between the two oxygen atoms. Moreover, the bond is nonpolar, since the atoms linked together are the same: both are oxygen atoms. This means that the electrons of the bond are shared equally between the two oxygen atoms.

Detailed explanation-4: -An electronegativity difference of zero, of course, indicates a nonpolar covalent bond. Figure 4.4. 2 Electronegativities of Various Elements. A popular scale for electronegativities has the value for fluorine atoms set at 4.0, the highest value.