A table in which the chemical elements are arranged in order of increasing atomic number. Elements with similar properties are arranged in the same column (called a group), and elements with the same number of electron shells are arranged in the same row (called a period).
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Find another word for protactinium. In this page you can discover 4 synonyms, antonyms, idiomatic expressions, and related words for protactinium, like: periodic-table, protoactinium, p.a. and atomic number 91.