# What are transition elements?

Jul 29, 2016

A transition element is an element whose d-block is never fully filled in its atomic state as well as in its ionic state .

#### Explanation:

• Elements of Group 3-11 are all transition elements.
Oct 10, 2016

The elements in the center of the periodic table

#### Explanation:

They are the elements towards the middle of the periodic table.

They are separated from the rest of the elements because their valence electrons are in both the $\text{4s}$ and $\text{3d}$ subshells.

Transition elements are more strictly defined as elements whose atoms have an incomplete $\text{d}$ sub-shell.

This definition excludes elements in Group 12, as they have full ${\text{d}}^{10}$ configurations.

Thus, $\text{Zn, Cd, Hg}$, and probably $\text{Cn}$ are not transition elements even though they are in the $\text{d}$-block.