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Diatomic Molecules
These molecules are composed of two atoms of the same element.
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| A | B |
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| hydrogen | lightest gas |
| nitrogen | about 80% of air |
| oxygen | about 20% of the air |
| fluorine | pale yellow gas |
| chlorine | yellow-green gas |
| bromine | reddish-brown liquid |
| iodine | bluish-black solid |
| helium | Oops -- NOT diatomic |
| triple bond | N-N |
| double bond | 0-0 |
| single bond | H-H |
| covalent | shared electrons |
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