What are the characteristics of the transition elements and why are they called transition elements?

Monjur Alahi

What are the characteristics of the transition elements and why are they called transition elements? Which of the d-block elements may not be regarded as the transition elements?


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Salim Ahmed Kawsar

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Transition elements are those elements in which the atoms or ions (in stable oxidation state) contain partially filled d-orbital. These elements lie in the d-block and show a transition of properties between s-block and p-block. Therefore, these are called transition elements. Elements such as Zn, Cd, and Hg cannot be classified as transition elements because these have completely filled d-subshell.

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Salim Ahmed Kawsar

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Transition elements have incompletely filled d orbitals in its ground state or in any one of its oxidation states.
d-block elements are called transition elements and they lie between s and p block elements also all their properties are intermediate between s and p block elements.

Zn, Cd, Hg (elements of group 12) are not considered as transition metals because they have fully filled (d10)d orbitals configuration in its ground state as well as in their common oxidation state.

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