Al2S3, commonly known as aluminum sulfide, is classified as an ionic compound. This classification stems from the bond formation between aluminum and sulfur atoms.
In ionic compounds, there is a transfer of electrons from one atom to another, leading to the formation of charged ions. In the case of Al2S3, aluminum (Al) has a tendency to lose three electrons, forming a positively charged ion (Al3+), while sulfur (S) tends to gain two electrons to form two negatively charged ions (S2-). This electron transfer creates ionic bonds, resulting in the compound’s formation.
The structure of Al2S3 is characterized by a repeating three-dimensional lattice of these ions that are held together by electrostatic forces. Therefore, while Al2S3 consists of molecules in a sense, it does not fit the definition of a molecular compound due to the strong ionic attractions present.
In summary, Al2S3 is an ionic compound formed through the transfer of electrons between aluminum and sulfur, resulting in the formation of ions that bond together in a stable arrangement.