Final answer:
A nonpolar covalent bond forms between two atoms of the same element or between different elements that share electrons equally. Nitrogen gas (N2) is an example of a substance with a nonpolar covalent bond.
Step-by-step explanation:
A nonpolar covalent bond forms between two atoms of the same element or between different elements that share electrons equally. One example of a substance that contains a nonpolar covalent bond is nitrogen gas, N2. In N2, the two nitrogen atoms share the electrons equally, resulting in a nonpolar molecule.