Nobelium

{ syn. }

{ syn. }

Nobelium is an exclusively artificially produced chemical element with the element symbol No and atomic number 102 In the periodic table it is in the group of actinides (7th period, f - block) and is also among the transuranic elements. Nobelium is a radioactive metal that but have not been shown as a metal due to the limited quantities available. It was discovered in 1957 and named in honor of Alfred Nobel. The name was finally confirmed in 1994 by the IUPAC.

History

About a discovery was first reported in 1957 by a working group of scientists from the U.S., UK and Sweden. 1958 Albert Ghiorso thought, Torbjørn Sikkeland, John R. Walton and Glenn T. Seaborg discovered in the Berkeley 254No to have. Furthermore, in the same year reported a Soviet group GN Flerov the discovery of a top choice. 1964 was reported in Dubna the production of 256No. But not until 1968 were produced in Berkeley from 249Cf and about 3000 12C atoms 255No.

Properties

In the periodic table is the nobelium with the atomic number 102 in the series of actinides, its predecessor is the Mendelevium, the subsequent element is the Lawrencium. Its analogue in the series of lanthanides, the ytterbium.

Nobelium is a radioactive and very short-lived metal. In its compounds, the oxidation number 2 3 opposite occurs frequently.

Safety

Classifications according to the Hazardous Substances Ordinance are not available because they only include the chemical danger and play a very minor role compared to the risks based on the radioactivity. Even the latter applies only if there is a relevant material for this amount.