WordNet
atomic number 83
n. a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals [syn: bismuth, Bi]
Usage examples of "atomic number 83".
Element 101 has indeed been discovered since Campbell wrote Marooned but it is named mendelevium and it is unstable, as are all elements beyond atomic number 83.