Fluorine: From Supernovas to Toothpaste

By Nikhita Shankar What do your toothpaste and a supernova a gazillion miles away have in common? Fluorine. Fluorine is a rare chemical element sandwiched between oxygen and neon on the periodic table and has two isotopes. It is what we call a gaseous halogen. In contrast to oxygen and neon, fluorine does not make …