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QUESTION

# How is a single covalent bond formed?

Just like in H_2, Cl_2, CH_4.

A single covalent bond is formed when 2 atoms share only 1 pair of electrons between them, thus attaining more stability. When a strong sigma bond is formed between the two atoms, as a form of a molecule or compound, the atomic orbitals directly overlap between the nuclei of two atoms.