Unlike ionic bonds, covalent bonds involve the
a. development of positively and negatively charged ions.
b. sharing of electrons between atoms.
c. gain of one or more electrons by one atom from another.
d. loss of one or more electrons from one atom to another. machinery

Unlike ionic bonds, covalent bonds involve the sharing of electrons between atoms.
- - Final  b. sharing of electrons between atoms.

Ionic bonds involve the TRANSFER of electrons, giving it a charge. However, a covalent bond involves the SHARING of electrons, giving it a neutral charge.

Therefore, our answer is :-   b. sharing of electrons between atoms.

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