Gen Chem

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For my chem class I have 3 elements and have to find what they are used for today or an interesting fact. I have looked but I can't really fin anything. My elements are:
Cobalt,Thulium, and Roentgenium

I found that cobalt is used in money (nickels, quarters, and dimes, but that's all. If you could help my in anyway that would be amazing!
thank you

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