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 soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
Find another word for thorium. In this page you can discover 3 synonyms, antonyms, idiomatic expressions, and related words for thorium, like: periodic-table, th and atomic number 90.