An element with an incomplete d subshell. Elements which have common cations with incomplete d subshells are also considered transition metals. Elements with incomplete f subshells are sometimes called "inner transition elements".
TRANSITION METAL (TRANSITION ELEMENT; OUTER TRANSITION ELEMENT)
Meaning of TRANSITION METAL (TRANSITION ELEMENT; OUTER TRANSITION ELEMENT) in English
General chemistry English glossary. Английский глоссарий общей химии. 2012