| the air | 0.20 |
| make distinctive blue-g… | 0.34 |
| form clathrate | 0.29 |
| form compound | 0.29 |
| summon their magical po… | 0.29 |
| prevent oxidation | 0.29 |
| enter space | 0.25 |
| filter up into the crust | 0.25 |
| prevent other chemical … | 0.25 |
| filter up through the e… | 0.25 |
| help protect the paper | 0.25 |
| same solubility | 0.25 |
| atomic weight of 39.948 | 0.25 |
| low thermal conductivity | 0.23 |
| colorless | 0.54 |
| nontoxic | 0.37 |
| mobile | 0.34 |
| inexpensive | 0.34 |
| neuroprotective | 0.32 |
| useful | 0.29 |
| the most abundant | 0.28 |
| tasteless | 0.28 |
| clear | 0.28 |
| flammable | 0.26 |
| More » |
| gas | 0.72 |
| inert gas | 0.68 |
| the third most common g… | 0.48 |
| noble gas | 0.48 |
| a chemical element | 0.43 |
| rare gas | 0.29 |
| colorless, nontoxic gas | 0.16 |
| useful pure gas | 0.16 |
| used as a shielding gas | 0.61 |
| produced | 0.46 |
| passed over the mixture | 0.43 |
| blended with helium | 0.39 |
| introduced into the cha… | 0.36 |
| present in the atmosphe… | 0.34 |
| released | 0.32 |
| bound | 0.32 |
| detected as impurity | 0.32 |
| discovered in 1894 | 0.29 |
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