How are elements in the same group similar?

We appreciate you asking about elements on the periodic table that belong to the same group.

The valence electrons, which are those on the energy level furthest from the nucleus and are involved in bonding with other atoms to form compounds, are the same number for all the elements in a given group.

In chemistry, elements belonging to the same group behave similarly because they share the same number of valence electrons.

The alkali metals, from lithium to francium, are an example. All of these metals have one valence electron, act similarly, are highly active, are not found free in nature, and react violently with water. The only exception to this rule is hydrogen, which is only included in this group because it has one valence electron and is not a metal.

The key is the same number of valence electrons, I hope this helps.

Because they share the same number of valence electrons, elements in the same group have similar chemical properties, including similar bonding patterns and reactivity.

Elements in the same group have similar chemical properties because they have the same number of valence electrons. This similarity in valence electron configuration leads to comparable reactivity and bonding characteristics among group members. Additionally, elements in the same group often exhibit similar physical properties, such as melting and boiling points, as well as atomic radii. These similarities arise due to the periodic nature of the periodic table, where elements within the same group share analogous electronic configurations, resulting in comparable chemical behavior.