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Bond formation in hydrogen molecule. Illustration of the sharing of electrons (dots and crosses) between two hydrogen atoms (H) to form a molecule of hydrogen (H2). This is an example of covalent bonding, with the single bond formed by a shared electron pair consisting of an electron from each atom. The outer electron shell of each atom is shown as a red ring. Hydrogen is a gas at room temperature and pressure. For the atoms before the bonds form, see image C028/6482.
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