How many valence electrons do halogens possess?

Halogens, which are found in Group 17 of the periodic table, possess seven valence electrons. This is a key characteristic that defines their behavior in chemical reactions. The number of valence electrons is crucial because it influences an element’s ability to bond with other atoms. Halogens typically gain one additional electron to achieve a full valence shell, which corresponds to the stable configuration of eight electrons, similar to the noble gases.

This property makes halogens highly reactive, as they seek to complete their outer shell through interactions with other elements, often forming ionic or covalent bonds in the process. Their seven valence electrons are vital for forming these bonds and participating in various chemical reactions.