What is the function of electrons in an atom?

Electrons play a crucial role in the behavior of atoms, particularly in chemical bonding and reactions. They occupy specific energy levels or orbitals around the nucleus and are involved in the formation of chemical bonds between atoms. When atoms interact, it is typically through the sharing, gaining, or losing of electrons, which leads to the creation of molecules.

In covalent bonds, for example, electrons are shared between atoms, while in ionic bonds, one atom transfers electrons to another. These interactions determine the chemical properties of substances and how they will react with one another. Therefore, the function of electrons in facilitating these connections and reactions is fundamental to understanding chemistry and the behavior of matter. This is why the choice that highlights their involvement in chemical bonding and reactions is the correct answer.