The reactivity of an atom depends on

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The reactivity of an atom depends on the number of valence electrons it has. Valence electrons are the outermost electrons in an atom's electron shell and are involved in chemical reactions. Atoms with fewer valence electrons tend to be reactive as they seek to gain electrons to complete their outer shell, while atoms with a full outer shell are stable and less reactive. Therefore, the number of valence electrons is the best choice for determining an atom's reactivity.

The Reactivity of an Atom Depends on