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Elements with seven valence electrons are most likely classified as nonmetals. This classification is based on the fundamental properties of the elements found in Group 17 of the periodic table, also known as the halogens. These elements, which include fluorine, chlorine, bromine, iodine, and astatine, have a very high tendency to gain one electron to achieve a stable octet configuration, which is characteristic of nonmetals.

Nonmetals typically possess properties such as poor electrical conductivity, varying states at room temperature (gases, liquids, or solids), and the ability to form covalent bonds and anions. The presence of seven valence electrons makes these elements highly electronegative, allowing them to readily react with metals and other nonmetals.

In contrast, metals, which tend to have fewer than four valence electrons, are usually good conductors of electricity and heat and are malleable and ductile. Metalloids possess some characteristics of both metals and nonmetals, often found bordering the metal and nonmetal categories on the periodic table and frequently exhibiting semiconducting properties. Noble gases, located in Group 18, are known for having a complete valence shell of eight electrons, rendering them chemically inert and un