Question

What do you mean transition metal in periodic table?

Answer 1

Any of the metallic elements within Groups 3 through 12 in the Periodic Table. All the transition metals have two electrons in their outermost shell, and all but zinc, cadmium, and mercury have an incompletely filled inner electron orbital just beneath the outer orbital.

... See Periodic Table.

Answer 2

Transition metal, any of various chemical elements that have valence electrons—i.e., electrons that can participate in the formation of chemical bonds—in two shells instead of only one.

Elements: Gold; Copper; Iron; Platinum; Rhenium...