What are typical and non-typical transition elements?

Transition elements, also known as transition metals, are a group of elements in the periodic table that have partially filled d-orbitals. They are typically located in the center of the periodic table, between the main group elements. While the definition of transition elements can vary depending on the context, they generally include elements from groups 3 to 12 (or groups 3 to 11 in some older definitions) of the periodic table.

Typical Transition Elements:

Iron (Fe)
Copper (Cu)
Zinc (Zn)
Nickel (Ni)
Chromium (Cr)
Manganese (Mn)
Titanium (Ti)
Vanadium (V)
Cobalt (Co)
Silver (Ag)
These are some of the most well-known and commonly recognized transition elements. They exhibit typical properties of transition metals, such as the ability to form colorful compounds, multiple oxidation states, and the capacity to act as good catalysts.

Non-typical Transition Elements:
While the elements mentioned above are considered typical transition elements, there are a few elements that are sometimes included in discussions due to their partially filled d-orbitals but exhibit some non-typical properties. These include:

Scandium (Sc): Scandium is often considered a transition element because it has a partially filled d-orbital, but it doesn't display many of the typical properties of transition metals.

Zinc (Zn): Zinc is not typically considered a transition element, despite having a partially filled d-orbital. This is because it does not exhibit many of the characteristic properties of transition metals, such as variable oxidation states.

Cadmium (Cd): Cadmium is similar to zinc in that it has a partially filled d-orbital but lacks some of the typical properties of transition elements.

The classification of elements as typical or non-typical transition elements can vary depending on the specific criteria or context used by chemists and researchers. While there is a general consensus on which elements are considered typical transition elements, there can be some debate about the inclusion of certain elements in this category.