The following element occurs as diatomic molecules by completing their octets.
The octet rule is a chemical rule of thumb that reflects the theory that main- group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
            H+H ⇒ H-H ⇒ H₂
            Fl+Fl ⇒ Fl-Fl ⇒ Fl₂
            O+O ⇒ O=O ⇒ O₂
            N+N ⇒ N≡N ⇒ N₂
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