Oxygen, of course, is a gas, polonium a metal, and the in-between elements, sulfur, selenium and tellurium, are all solids that show increasing metallic properties. In fact, tellurium (Te), which ...

"These glasses exclude oxygen, and that's what makes them special ... glasses he and Richardson study to a "soup" where sulfur, selenium and tellurium serves as a base. Germanium, arsenic and ...