| bohrium | (n) a transuranic element, Syn. element 107, Bh, atomic number 107 |
| dubnium | (n) a transuranic element, Syn. element 105, hahnium, Db, atomic number 105 |
| fermium | (n) a radioactive transuranic metallic element produced by bombarding plutonium with neutrons, Syn. Fm, atomic number 100 |
| hassium | (n) a radioactive transuranic element, Syn. Hs, atomic number 108, element 108 |
| lawrencium | (n) a radioactive transuranic element synthesized from californium, Syn. atomic number 103, Lr |
| meitnerium | (n) a radioactive transuranic element, Syn. atomic number 109, element 109, Mt |
| mendelevium | (n) a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol), Syn. atomic number 101, Mv, Md |
| neon | (n) a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts, Syn. Ne, atomic number 10 |
| nobelium | (n) a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known, Syn. atomic number 102, No |
| rutherfordium | (n) a radioactive transuranic element which has been synthesized, Syn. Unq, atomic number 104, element 104, unnilquadium, Rf |
| seaborgium | (n) a transuranic element, Syn. atomic number 106, element 106, Sg |
