Elements in the same group have similar electron configurations from "summary" of The Periodic Table: A Very Short Introduction by Eric R. Scerri
The concept that elements in the same group have similar electron configurations is a fundamental principle of the periodic table. This means that elements within a group share certain common characteristics when it comes to the arrangement of their electrons. For example, all elements in Group 1 of the periodic table, also known as the alkali metals, have one electron in their outermost shell. This shared electronic configuration gives these elements similar chemical properties, such as their tendency to form positively charged ions by losing this single electron. Similarly, elements in Group 17, known as the halogens, have seven electrons in their outermost shell. This electron configuration makes these elements highly reactive, as they only need to gain one electron to ...
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