Promethium is a chemical element that is radioactive and is denoted by the symbol Pm with the atomic number of 61. Promethium was first found by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. ...

Erbium…though it sounds like a name created by one of the less than stellar characters from Bill and Ted’s Excellent Adventure, erbium is actually one of Earth’s rare elements. In fact, it is often found ...

One of Earth’s rare elements is a metal called dysprosium, though you likely have not heard much about this element. You might not know it, but dysprosium is a metal that you really should be ...

1. The scientific community has two accepted definitions for transition metals: first, it is an element with incomplete d sub-shell atoms, which may or may not result to cations with incomplete d sub-shells. The second ...