Covalent bond between hydrogen atoms
Each hydrogen atom has one electron. To complete their valence shells, they bond and share one electron with each other. This allows electrons to move about both atoms and gives both atoms access to two electrons; they become a stable H2 molecule joined by a single covalent bond.
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"General Chemistry/Covalent bonds."
http://en.wikibooks.org/wiki/General_Chemistry/Covalent_bonds%23The_Valence_Bond_Model
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