| react with cold water | 0.53 |
| deserve attention | 0.26 |
| raise the cell | 0.25 |
| emit electron | 0.25 |
| persist in the environm… | 0.16 |
| a chemical element | 0.68 |
| alkali metal | 0.53 |
| removed | 0.42 |
| used in atomic clocks | 0.42 |
| released | 0.34 |
| deposited | 0.34 |
| eluted in the water | 0.25 |
| used in photoelectric c… | 0.25 |