Chemical Formula
No
Background
In 1957, a group of scientists at the Nobel Institute of Physics in Sweden discovered a new element with a half-life of 10 min by bombarding curuim-244 atoms with carbon-13 ions in a cyclotron. In 1958, another team consisting of John R. Walton, Torbørn Sikkeland, Glenn T. Seaborg and Albert Ghiorso working at the University of California, Berkeley attempted to confirm the discovery of the former team, and failed to produce that isotope. However, the Berkeley team did produce nobelium-254 with a half-life of 3 s by bombarding curium-246 atoms with carbon-12 ions. A third group from the Joint Institute for Nuclear Research in Russia was also unable to produce the Noble institute team's results, but they confirmed Berkeley's group work. Hence the credit for the discovery of nobelium was given to the scientists of the University of California.
Basic Information
| Name |
Nobelium |
| Symbol |
No |
| Atomic number |
102 |
| Atomic weight |
259 amu |
| Standard state |
Presumably a solid at 298 K |
| CAS Registry ID |
10028-14-5 |
| Group name |
Actinoid |
| Period in periodic table |
7 |
| Block in periodic table |
f-block |
| Color |
Unknown, but probably metallic and silvery white or grey in appearance |
| Classification |
Metallic |
| Melting point |
1100 K (827°C or 1520°F) |
| Boiling point |
Unknown |
Occurrence
Nobelium is not found in nature.
Nobelium - Periodic Table of Videos
Isotopes
Nobelium has 12 radioactive isotopes with mass numbers from 250No to 262No. The longest-lived isotopes of nobelium include
- 259No with a half-life of 51.5 min
- 255No, with a half-life of 31.8 min
- 253No with a half-life of 1.7 min.
Production
Nobelium is produced via nuclear bombardment of californium-249 or other transuranium atoms with carbon-12 ions in the cyclotron.
Key Properties
The key properties of nobelium are listed below:
- It is a radioactive rare earth metal
- It is usually divalent in aqueous solution and hence more stable.
Applications
Nobelium applications are limited to scientific research only.
References
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