Question

Which of the following statements correctly describe a polar covalent bond? Select all that apply.

A. A polar bond is a covalent bond in which electrons are shared equally.
B. In a polar covalent bond the electron density is highest over the more electronegative atom.
C. A bond between atoms whose electronegativities differ by more than 0.4 but less than 1.7 is polar.
D. In a polar covalent bond the atom with the lower electronegativity is marked δ- because it has less electron density.

Answer 1

A polar covalent bond is a covalent bond in which the electrons are shared unequally. The statements that correctly describe a polar covalent bond are: the electron density is highest over the more electronegative atom, a bond between atoms with electronegativities differing by more than 0.4 but less than 1.7 is polar, and in a polar covalent bond, the atom with the lower electronegativity is marked δ- due to less electron density.

Step-by-step explanation:

A polar covalent bond is a covalent bond in which the electronegativity difference between the atoms is between 0.4 and 1.7. In this type of bond, the electrons are shared unequally between the atoms, resulting in a partial positive charge on one atom and a partial negative charge on the other. The atom with the higher electronegativity attracts the electrons more strongly, leading to a higher electron density around that atom.

Therefore, the correct statements are:

• B. In a polar covalent bond the electron density is highest over the more electronegative atom.
• C. A bond between atoms whose electronegativities differ by more than 0.4 but less than 1.7 is polar.
• D. In a polar covalent bond the atom with the lower electronegativity is marked δ- because it has less electron density.