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:

Question

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

Answer 1

http://en.wikipedia.org/wiki/Thulium

http://education.jlab.org/itselemental/ele111.html