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Nobelium Facts

Chemical & Physical Properties

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Nobelium is a radioactive metal.

Nobelium is a radioactive metal.

Architetto Francesco Rollandin, openclipart.org This is the electron configuration of a nobelium atom.

This is the electron configuration of a nobelium atom.

This is the location of nobelium on the periodic table.

This is the location of nobelium on the periodic table.

Todd Helmenstine
Periodic Table of the Elements

Nobelium

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)

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), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.)

 

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