valence electrons
the electrons of an atom that have the highest energy
Valence electrons are the outermost electrons in an atom that participate in chemical bonding. These electrons determine the reactivity and chemical properties of an element. The number of valence electrons in an atom can be determined by its position in the periodic table. For example, elements in group 1 (also known as the alkali metals) have one valence electron, elements in group 2 (the alkaline earth metals) have two valence electrons, and elements in group 18 (also known as the noble gases) have eight valence electrons. The valence electrons are involved in forming chemical bonds with other atoms, either by losing, gaining, or sharing electrons to achieve a stable electron configuration. Understanding valence electrons is essential in predicting the properties and behavior of elements in chemical reactions.
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