nobelium no·bel·i·um (nō-běl'ē-əm)
A radioactive synthetic element in the actinide series; its longest-lived isotope is No 259 with a half-life of 58 minutes. Atomic number 102.
A synthetic, radioactive metallic element in the actinide series that is produced by bombarding curium with carbon ions. Its longest-lived isotope is No 255 with a half-life of 3.1 minutes. Atomic number 102. See Periodic Table.