Elements in the same group share similar chemical properties from "summary" of The Periodic Table: A Very Short Introduction by Eric R. Scerri
Elements situated in the same group of the periodic table exhibit analogous chemical behavior. This generalization holds true for the majority of the groups in the table. For instance, the alkali metals, found in Group 1, are known for their high reactivity with water. They readily form ionic compounds and display similar trends in reactivity down the group. Moving across the table, the halogens in Group 17 also share common characteristics, such as high electronegativity and the ability to form salts with metals. The underlying reason for this similarity in chemical properties lies in the electronic configuration of these elements. Elements within the same group possess the same number of electrons in their outermost energy level, also known as the valence shell. This shared electron configuration results in comparable chemical reactivity as elements strive to achieve a stable electron configuration by either gaining, lo...
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