Mysterious element promethium finally reveals its chemical properties
The highly unstable radioactive element promethium is hard to study in the lab, but chemists have now coaxed it into forming a compound in water so they can observe its bonding behaviour
![Mysterious element promethium finally reveals its chemical properties](https://images.newscientist.com/wp-content/uploads/2024/05/21154237/SEI_205363391.jpg)
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