Which of the following describes a covalent bond?

A = it is the exchange of electrons between atoms with an electronegativity difference above 1.7

B = it is the exchange of electrons between atoms with an electronegativity difference below 1.7

C = it is the sharing of electrons between atoms with an electronegativity difference above 1.7

D = it is the sharing of electrons between atoms with an electronegativity difference below 1.7

D. It is the sharing of electrons between atoms with an electronegativity difference below 1.7

Covalent bonds share electrons, whereas ionic bonds exchange electrons. Covalent bonds have an electronegativity of 0.0-1.7 (0.0-0.3 is a nonpolar covalent bond and 0.3-1.7 is a polar covalent bond). Ionic bonds are bonds that go beyond the electronegativity of 1.7 to 4.0 (1.7-4.0).

D = It is the sharing of electrons between atoms with an electronegativity difference below 1.7

Explanation:

Covalent bond is the sharing of electrons between atoms, the electron pair is also known a shared pair. Covalent bond is also known as chemical bond or a molecular bond.

Electronegativity of covalent bonds is below than 1.7, because if the electronegativity is more than 1.7 the bond will be ionic and an ionic bond donates electron to the other which is participating in bond formation. The electronegativity between 0.4 to 1.7, the bond will be polar covalent and the electronegativity is less than 0.4, the bond will be non polar covalent bond.