In this topic, we will concern ourselves with the elements of the third period: scandium to zinc. The electron configurations of the 3rd period d-block elements are shown below: The electron ...

Elements in the same horizontal row are in the same period. The periods are numbered from top to bottom. The period number is the same as the number of occupied electron shells.

Elements in group 1 and group 2 are metals. Atoms of group 1 elements have one electron in their outer shell, and atoms of group 2 elements have two electrons in their outer shell. Elements in ...