What is another word for protactinium?
Pronunciation: [pɹˌə͡ʊtɐktˈɪni͡əm] (IPA) 
Protactinium is a chemical element with the atomic number 91. It is a radioactive metal that is silver-gray in color. When it was first discovered, it was named "protoactinium," which means "before actinium." Synonyms for protactinium include protoactinium, element 91, and Pa. The symbol Pa is derived from its name, which is derived from the Greek word "protos," meaning "first," and "actinium," the element that comes after protactinium in the periodic table. Other synonyms for protactinium include proactinium, protothorium, and brevium. Protactinium has a half-life of 32,760 years, and it is used in nuclear reactors, as well as in scientific research.
