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).
P.m. is defined as post meridiem in Latin, which means after 12 noon.
a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
Find another word for promethium. In this page you can discover 3 synonyms, antonyms, idiomatic expressions, and related words for promethium, like: periodic-table, pm and atomic number 61.