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Transition metal, any of various chemical elements that have valence electrons—i.e., electrons that can participate in the formation of chemical bonds—in two shells instead of only one. They occupy the middle portions of the long periods of the periodic table of the elements.
In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and less often group 3) are sometimes excluded.
The most common definition of a transition metal is the one accepted by the IUPAC. A transition metal is an element with a partially-filled d subshell or the capacity to produce cations with an incomplete d subshell.
The meaning of TRANSITION METAL is any of various metallic elements (such as chromium, iron, and nickel) that have valence electrons in two shells instead of only one —called also transition element.
This page explains what a transition metal is in terms of its electronic structure, and then goes on to look at the general features of transition metal chemistry. These include variable oxidation state (oxidation number), complex ion formation, colored ions, and catalytic activity.
IUPAC defines transition elements as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
Transition metals are defined as those elements that have (or readily form) partially filled d orbitals. As shown in Figure 19.1.2, the d-block elements in groups 3–11 are transition elements.
According to the IUPAC, a transition metal is any element with a partially filled d electron sub-shell. This describes groups 3 through 12 on the periodic table, although the f-block elements (lanthanides and actinides, below the main body of the periodic table) are also transition metals.
What are transition metals? The transition metals are metallic elements that act as a link between the two sides of the table. The transition elements are found in the d block of the Periodic Table, between Groups 2 and 13. However, not all d-block elements are classified as transition elements.
Answer: Most of the elements on the Periodic Table are transition metals. These are elements that have partially filled d sublevel orbitals. Have you ever wondered why they are called transition metals? What transition are they undergoing?