Transition Metal

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

  • The IUPAC definition states that a transition metal is "an element whose atom has an incomplete d sub-shell, or which can give rise to cations with an incomplete d sub-shell".
  • Most scientists describe a "transition metal" as any element in the d-block of the periodic table, which includes groups 3 to 12 on the periodic table. All elements in the d-block are metals. In actual practice, the f-block is also included in the form of the lanthanide and actinide series.

Jensen has reviewed the history of the terms transition element (or metal) and d-block. The word transition was first used to describe the elements now known as the d-block by the English chemist Charles Bury in 1921, who referred to a transition series of elements during the change of an inner layer of electrons (for example n=3 in the 4th row of the periodic table) from a stable group of 8 to one of 18, or from 18 to 32.

Read more about Transition Metal:  Classification, Characteristic Properties

Other articles related to "transition, transition metal, transition metals, metals, metal":

Mott Transition - Conceptual Explanation
... The Mott transition is the point in between ... Mott argued that the transition must be sudden, occurring when the density of free electrons N and the Bohr radius satisfies ... Simply put, a Mott Transition is a change in a material's behavior from insulating to metallic due to various factors ...
Transition Metal - Characteristic Properties - Other Properties
... As implied by the name, all transition metals are metals and conductors of electricity ... In general transition metals possess a high density and high melting points and boiling points ... However the group 12 metals have much lower melting and boiling points since their full d subshells prevent d–d bonding ...
D Electron Count - Standard Electron Configuration Perspective
... The electron configuration for transition metals predicted by the simple Aufbau principle and Madelung's rule has serious conflicts with experimental observations for transition metal ... Under most conditions all of the valence electrons of a transition metal center are located in d orbitals while the standard model of electron configuration would predict some ... The valence of a transition metal center can be described by standard quantum numbers ...
Transition Metal Hydride
... Transition metal hydrides are chemical compounds containing a transition metal bonded to hydrogen ... Most transition metals form hydride complexes and some are significant in various catalytic and synthetic reactions ...
Wolf Prize In Chemistry - Laureates
... pioneering and fundamental contributions to synthetic transition metal chemistry, particularly transition metal hydrides and dinitrogen complexes. 2000 Frank Albert Cotton United States for opening up an entirely new phase of transition metal chemistry based on pairs and clusters of metal atoms directly linked by single or ...

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