Animation of the bonding between two hydrogen atoms to form a molecule of dihydrogen, H2. Each hydrogen atom has one proton with one electron in a 1s orbital around it. When two atoms approach each other, these 1s orbitals can combine to form a single molecular orbital, at a lower energy (closer to the proton) than the initial 1s atomic orbital. This process releases energy, making the formation of H2 from two atoms favourable. This type of bond is called a covalent bond.
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