Which property does the elements in each column of the representative elements series of the periodic table have in common

Answer 1

The elements in each column of the representative elements series, also known as the "A" groups or the main group elements, have the same number of valence electrons in their outermost energy level. This property is commonly known as the valence electron configuration. For example, Group 1 elements (alkali metals) all have 1 valence electron, Group 2 elements (alkaline earth metals) have 2 valence electrons, Group 13 elements have 3 valence electrons, and so on. This similar valence electron configuration contributes to similar chemical properties and reactivity among elements in the same column.