Question

what is common feature in the electronic configuration of metal atoms

Answer 1

The common feature is that they all are transition elements and they all have 7 valence electrons in their outermost shell.

Answer 2

The common characteristics of metal atoms  in the electronic configuration-

Metals have the capacity to lose electron. Thus, they have electropositivity character.

The outermost shell consist of 1,2, or 3 electrons.

Examples-

                   Na- 2, 8, 1

                    Ca- 2, 8, 8, 2

                     Al- 2, 8, 3

Transition metals are found in various oxidation states. They are found in first row which are Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn.