
Hydrogen atom is not stable. It can stable if it has 2 electrons (duplet rule). That is why, hydrogen gas consist of 2 atoms per molecule (diatomic molecule). When two hydrogen atoms are closely, the electrons are attracted by each hydrogen's protons, and share one of another to form an electron pair. As a result, there is a non polar covalent bond of hydrogen molecule, H2. The non polar bond is occurred, because these two hydrogen atoms have the same ability of attraction.
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