| resist oxidation | 0.43 |
| enter soil | 0.37 |
| enter water | 0.34 |
| enter the air | 0.30 |
| occur in small amounts | 0.30 |
| improve many physical p… | 0.29 |
| become airborne | 0.25 |
| drop after continuous 3… | 0.25 |
| carry out any activity | 0.21 |
| take on beautiful green… | 0.16 |
| high melting point | 0.30 |
| toxic | 0.59 |
| transparent | 0.50 |
| desirable | 0.40 |
| strong | 0.38 |
| expensive | 0.32 |
| nonmagnetic | 0.21 |
| unique | 0.16 |
| a chemical element | 0.64 |
| metal | 0.54 |
| rare element | 0.43 |
| lightweight metal | 0.43 |
| fourth element | 0.25 |
| mined | 0.60 |
| produced | 0.53 |
| handled with great care | 0.45 |
| used in nuclear reactors | 0.43 |
| alloyed with copper | 0.41 |
| used in electronic | 0.40 |
| selected for stability | 0.40 |
| used as moderator | 0.38 |
| added as alloying eleme… | 0.34 |
| selected for light weig… | 0.30 |
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