| consist of proton | 0.58 |
| consist of electron | 0.57 |
| form helium | 0.55 |
| share their electrons | 0.46 |
| exist in water | 0.45 |
| split into proton | 0.43 |
| release energy | 0.43 |
| absorb energy | 0.41 |
| form molecular hydrogen | 0.38 |
| exist in people | 0.29 |
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| one proton | 0.83 |
| one electron | 0.80 |
| positive charge | 0.49 |
| neutron | 0.48 |
| atomic number of 1 | 0.46 |
| 1 to 10 carbon atoms | 0.38 |
| molecular weight | 0.33 |
| 1 valence electron | 0.25 |
| bonded to oxygen | 0.67 |
| replaced by fluorine | 0.65 |
| replaced by alkyl | 0.62 |
| bonded | 0.55 |
| replaced by deuterium | 0.54 |
| bound to oxygen | 0.53 |
| attached to carbon | 0.52 |
| replaced by halogen | 0.48 |
| bonded to nitrogen | 0.47 |
| omitted for clarity | 0.46 |
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