Nobelium Facts - No Element

Nobelium Facts - No Element NobeliumBasic Facts Atomic Number: 102 Symbol: No Atomic Weight: 259.1009 Discovery: 1957 (Sweden) by the Nobel Institute for Physics; April 1958 at Berkeley by A. Ghiorso, T. Sikkeland, J.R. Walton, and G.T. Seaborg Electron Configuration: [Rn] 7s2 5f14 Word Origin: Named for Alfred Nobel, discoverer of dynamite and founder of the Nobel Prize. Isotopes: Ten isotopes of nobelium are recognized. Nobelium-255 has a half-life of 3 minutes. Nobelium-254 has a half-life of 55-s, Nobelium-252 has a half-life of 2.3-s, and Nobelium-257 has a half-life of 23-s. Sources: Ghiorso and his colleagues used a double-recoil technique. A heavy-ion linear accelerator was used to bombard a thin target of curium (95% Cm-244 and 4.5% Cm-246) with C-12 ions to produce No-102. The reaction proceeded according to the 246Cm(12C, 4n) reaction. Element Classification: Radioactive Rare Earth Element (Actinide Series) Nobelium Physical Data Melting Point (K): 1100 Appearance: Radioactive, synthetic metal. Atomic Radius (pm): 285 Pauling Negativity Number: 1.3 First Ionizing Energy (kJ/mol): (640) Oxidation States: 3, 2 References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952), CRC Handbook of Chemistry Physics (18th Ed.) Return to the Periodic Table