Taking into accoun the definition of covalent bond and polarity, two chlorine atoms form a nonpolar covalent bond.
The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The tendency of the elements to reach a stable configuration is known as the octet rule.
In other words, a covalent bond occurs in two atoms when they join and share one or more electrons of the last level to thus reach the "stable octet". Thus molecules are formed.
When there is an atom that attracts electrons with greater intensity, a greater concentration of electrons is generated in that part of the molecule. This phenomenon is called polarity.
Then, the polar covalent bond can be defined as a covalent bond in which the electrons are not distributed homogeneously, so as to have a pole with a negative partial charge and another pole with a positive partial charge.
On the other hand, the nonpolar covalent bond occurs when pairs of electrons are shared between atoms that have the same or very similar electronegativity, favoring an equitable distribution of electrons.
So, keeping the above definitions in mind, two chlorine atoms form a nonpolar covalent bond.
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