This is nice! The electron configurations are listed. Each row fills another layer of electrons. Much of chemistry follows from that. Other charts are more complicated (e.g. semi-metals and alkali earths) and require unneeded explanation. This chart shows is a large, but bite sized, concept. There are elements and they have patterns that can be described in a precisely ordered way using the number of electrons.
This is nice! The electron configurations are listed. Each row fills another layer of electrons. Much of chemistry follows from that. Other charts are more complicated (e.g. semi-metals and alkali earths) and require unneeded explanation. This chart shows is a large, but bite sized, concept. There are elements and they have patterns that can be described in a precisely ordered way using the number of electrons.