Which covalent bonds occur when nonmetal atoms do not have a significant electronegativity difference, resulting in no partial charges?

Which covalent bonds occur when nonmetal atoms do not have a significant electronegativity difference, resulting in no partial charges?

• A. Polar Covalent Bonds
• B. Nonpolar Covalent Bonds
• C. Ionic Bonds
• D. Metallic Bonds

Answer: (B)

When two nonmetal atoms share electrons, the key factor that determines whether the bond is polar or nonpolar is the difference in their electronegativities. If the difference is small, the shared electrons feel a similar pull from both atoms and are distributed more or less equally between them. That equal sharing means there are no partial charges developing on either atom, so the bond is nonpolar covalent. This type of bond is common when the atoms have almost the same electronegativity — for example, bonds between identical nonmetal atoms or between nonmetals with very similar electronegativities. Because the electron density is balanced, the molecule may be nonpolar overall if it’s also arranged symmetrically. In contrast, a polar covalent bond arises when one atom pulls the shared electrons more strongly, creating partial charges on the atoms. Ionic bonds form when the difference is large enough that electrons are effectively transferred, yielding ions that attract each other. Metallic bonds involve a lattice of metal atoms with a “sea” of delocalized electrons. So, the bond type described—no significant electronegativity difference and no partial charges—matches nonpolar covalent bonds.

When two nonmetal atoms share electrons, the key factor that determines whether the bond is polar or nonpolar is the difference in their electronegativities. If the difference is small, the shared electrons feel a similar pull from both atoms and are distributed more or less equally between them. That equal sharing means there are no partial charges developing on either atom, so the bond is nonpolar covalent.

This type of bond is common when the atoms have almost the same electronegativity — for example, bonds between identical nonmetal atoms or between nonmetals with very similar electronegativities. Because the electron density is balanced, the molecule may be nonpolar overall if it’s also arranged symmetrically.

In contrast, a polar covalent bond arises when one atom pulls the shared electrons more strongly, creating partial charges on the atoms. Ionic bonds form when the difference is large enough that electrons are effectively transferred, yielding ions that attract each other. Metallic bonds involve a lattice of metal atoms with a “sea” of delocalized electrons.

So, the bond type described—no significant electronegativity difference and no partial charges—matches nonpolar covalent bonds.