Final answer:
In chemical reactions, nonmetals generally gain electrons to form negatively charged ions called anions, achieving a stable electronic state like the next noble gas.
Step-by-step explanation:
When nonmetals form ions, they typically gain electrons to form negatively charged ions known as anions. This process results in nonmetals achieving a stable electronic configuration that is similar to the one of the next noble gas in the periodic table.
Nonmetals, particularly those in groups 16 and 17, and to a lesser extent those in Group 15, have a high electronegativity which drives them to gain electrons and form anions such as the chloride ion (Cl-), the nitride ion (N3-), and the selenide ion (Se2-). Unlike metals that typically lose electrons to form cations, nonmetals do not form monatomic positive ions (cations) in normal chemical processes due to their high ionization energies.