They all have a link to the periodic table ... theme with these elements, as bismuth is used in cosmetics too, as a colourant. It also makes extremely beautiful geometric crystals if you melt ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

Helium is one of the least reactive elements on the periodic table. Like the other noble gases ... This compression formed crystals containing both iron and helium. The volume of the crystal ...