proactinium
Look at other dictionaries:
unbiunium — noun The systematic element name for the (as yet undiscovered) chemical element with atomic number 121 (symbol Ubu). Syn: eka proactinium … Wiktionary
protactinium — A radioactive element, atomic no. 91, atomic wt. 231.03588, formed in the decay of uranium and thorium; its most long lived isotope, 231Pa, has a half life of 32,500 years. SYN: proactinium, protoactinium. [G. protos, first] … Medical dictionary
UX — uranium X, proactinium … Medical dictionary
UX — • uranium X, proactinium … Dictionary of medical acronyms & abbreviations
