(n) a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite, Syn.atomic number 9, F
(n) a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium, Syn.Np, atomic number 93
(n) a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239, Syn.atomic number 94, Pu
(n) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead, Syn.protoactinium, atomic number 91, Pa
(n) 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, Syn.Th, atomic number 90
(n) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons, Syn.U, atomic number 92
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