now, before we can talk about electron configurations. Realized first that Mendeleev organized the elements in the periodic table through periodic law in periodic land says that when arranged by increasing atomic weight, elements in the same group share similar chemical properties. These properties would influence their electron arrangements and by extension, their configurations. It would affect their trends and reactivity and their atomic structures. So remember, in order to first understand electronic configurations, we need to go into periodic law first, and it helps us to understand how the periodic table itself is organized.