What elements will have a similar chemical reactivity as sodium?

Elements that will have a similar chemical reactivity as sodium are those in the same group of the Periodic Table, specifically the alkali metals (Group 1). This includes lithium, potassium, rubidium, cesium, and francium. These elements share similar properties due to having one electron in their outermost shell, which they readily lose to form positive ions. Consequently, they exhibit comparable reactivity, especially with water and halogens.