Seaborgium

Seaborgium (IPA: /ˌsiːˈbɔː(r)giəm/), also called eka-tungsten, is a chemical element in the periodic table that has the symbol Sg and atomic number 106. Seaborgium is a synthetic element whose most stable isotope ²⁷¹Sg has a half-life of 2.4 minutes. Its chemistry probably resembles that of tungsten.

History

Element 106 was discovered almost simultaneously by two different laboratories. In June 1974, an American research team led by Albert Ghiorso at the Lawrence Radiation Laboratory at the University of California, Berkeley reported creating an isotope with mass number 263 and a half-life of 1.0 s, and in September 1974, a Soviet team led by G. N. Flerov at the Joint Institute for Nuclear Research at Dubna reported producing an isotope with mass number 259 and a half-life of 0.48 s,

Because their work was independently confirmed first, the Americans suggested the name seaborgium to honor the American chemist Glenn T. Seaborg credited as a member of the American team along with Ghiorso, J. M. Nitschke, J. R. Alonso, C. T. Alonso, M. Nurmia, E. Kenneth Hulet, and R. W. Lougheed in recognition of his participation in the discovery of several other actinides. The name selected by the team became controversial. An international committee decided in 1992 that the Berkeley and Dubna laboratories should share credit for the discovery.

An element naming controversy erupted and as a result IUPAC adopted unnilhexium (IPA: /ˌjuːnɪlˈhɛksiəm/, symbol Unh) as a temporary, systematic element name. In 1994 a committee of IUPAC recommended that element 106 be named rutherfordium and adopted a rule that no element can be named after a living person. This ruling was fiercely objected to by the American Chemical Society. Critics pointed out that a precedent had been set in the naming of einsteinium during Albert Einstein's life. In 1997, as part of a compromise involving elements 104 to 108, the name seaborgium for element 106 was recognized internationally.

Isotopes

Main article: Isotopes of seaborgium

There are 12 known isotopes of Seaborgium, the longest-lived of which is ²⁷¹Sg which decays through alpha decay and spontaneous fission. It has a half-life of 2.4 minutes. The shortest-lived isotope is ²⁵⁸Sg which also decays through alpha decay and spontaneous fission. It has a half-life of 2.9 ms.

References

Los Alamos National Laboratory - Seaborgium
National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2006).

External links

WebElements.com - Seaborgium

Dubnium (IPA: /ˈduːbniəm/), also called eka-tantalum, is a chemical element in the periodic table that has the symbol Db and atomic number 105.
..... Click the link for more information.

Bohrium (IPA: /ˈbɔːriəm/), also called eka-rhenium, is a chemical element in the periodic table that has the symbol Bh and atomic number 107.
..... Click the link for more information.

6, 5, 4, 3, 2, 1, 0, −1
(mildly acidic oxide)
Electronegativity 2.36 (scale Pauling)
Ionization energies 1st: 770 kJ/mol
2nd: 1700 kJ/mol
Atomic radius 135 pm
Atomic radius (calc.
..... Click the link for more information.

..... Click the link for more information.

<onlyinclude> This is a list of chemical elements, sorted by name and color coded according to type of element.

Given is each element's element symbol, atomic number, atomic mass or most stable isotope, and group and period numbers on the periodic table.
..... Click the link for more information.

<onlyinclude> This is a list of chemical elements by symbol, including the current signification used to identify the chemical elements as recognized by the International Union of Pure and Applied Chemistry, as well as proposed and historical signs.
..... Click the link for more information.

A table of chemical elements ordered by atomic number and color coded according to type of element. Given is each element's name, element symbol, group and period, Chemical series, and atomic mass (or most stable isotope).
..... Click the link for more information.

A group, also known as a family, is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table.

The modern explanation of the pattern of the periodic table is that the elements in a group have similar
..... Click the link for more information.

In chemistry, the term transition metal (sometimes also called a transition element) has two possible meanings:

It commonly refers to any element in the d-block of the periodic table, including zinc, cadmium and mercury.

..... Click the link for more information.

Periods:]] 1 2 3 4 5 6 7 8
Series Alkalis Alkaline earths Lanthanides Actinides Transition metals Poor metals Metalloids Nonmetals Halogens Noble gases
..... Click the link for more information.

A block of the periodic table of elements is a set of adjacent groups. The respective highest-energy electrons in each element in a block belong to the same atomic orbital type.
..... Click the link for more information.

A Group 6 element is one in the series of elements in group 6 (IUPAC style) in the periodic table, which consists of the transition metals chromium (Cr), molybdenum (Mo), tungsten (W), and seaborgium (Sg).
..... Click the link for more information.

A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the elements.

This period contains the heaviest element which occurs naturally on earth, uranium.
..... Click the link for more information.

D-Block is an American rap group founded in the 1990s by Sheek Louch, Jadakiss and Styles P as The Lox or The L.O.X.. ^[1] In 2001 the group renamed themselves from "The Lox" to "D-Block".
..... Click the link for more information.

Color or colour^[1] (see spelling differences) is the visual perceptual property corresponding in humans to the categories called red, yellow, blue, black, etc.
..... Click the link for more information.

atomic mass (m_a) is the mass of an atom at rest, most often expressed in unified atomic mass units.^[1] The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless).
..... Click the link for more information.

To help compare different orders of magnitude, the following list describes various mass levels between 10⁻³⁶ kg and 10⁵³ kg.

Factor (kg) Value Item
10⁻³⁶ 1.
..... Click the link for more information.

electron configuration is the arrangement of electrons in an atom, molecule, or other physical structure (e.g., a crystal). Like other elementary particles, the electron is subject to the laws of quantum mechanics, and exhibits both particle-like and wave-like nature.
..... Click the link for more information.

Radon (IPA: /ˈreɪdɒn/) is a chemical element that has the symbol Rn and atomic number 86. Radon is a radioactive noble gas that is formed by the decay of radium.
..... Click the link for more information.

Electron

Theoretical estimates of the electron density for the first few hydrogen atom electron orbitals shown as cross-sections with color-coded probability density
Composition: Elementary particle
Family: Fermion
Group: Lepton
Generation: First
..... Click the link for more information.

An electron shell, also known as a main energy level, is a group of atomic orbitals with the same value of the principal quantum number n. Electron shells are made up of one or more electron subshells, or sublevels
..... Click the link for more information.

In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i.e. density, crystal structure, index of refraction, and so forth).
..... Click the link for more information.

A solid object is in the states of matter characterized by resistance to deformation and changes of volume. At the microscopic scale, a solid has these properties :

The atoms or molecules that comprise the solid are packed closely together.

..... Click the link for more information.

In physics, density is mass m per unit volume V—how heavy something is compared to its size. A small, heavy object, such as a rock or a lump of lead, is denser than a lighter object of the same size or a larger object of the same weight, such as pieces of
..... Click the link for more information.

Room temperature (also referred to as ambient temperature) is a common term to denote a certain temperature within enclosed space at which human beings are accustomed.
..... Click the link for more information.

crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a motif, a set of atoms arranged in a particular way, and a lattice. Motifs are located upon the points of a lattice, which is an array of points repeating periodically in three
..... Click the link for more information.

Not to be confused with oxidation state.

The oxidation number of an element in a molecule or complex is the charge that it would have if all the ligands (basically, atoms that donate electrons) were removed along with the electron pairs that were shared
..... Click the link for more information.

ACID (Atomicity, Consistency, Isolation, Durability) is a set of properties that guarantee that database transactions are processed reliably. In the context of databases, a single logical operation on the data is called a transaction.
..... Click the link for more information.

This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.

Herod_Archelaus

iPedia Free Information Center

Seaborgium

Information about Seaborgium

History

Isotopes

References

External links