Definitions for "Transition element"
A special ‘T' shaped 5-node element which makes the transition between a one dimensional element and a two dimensional element.
The transition elements are those elements that have partially-filled d- or f-orbitals, or which form compounds that have partially-filled d- or f-orbitals.
transition metal: an element found in one of the B groups in the periodic table; an element whose highest energy electron is in a sublevel.