What term describes a chemical combination of two or more atoms from different elements?

The term that accurately describes a chemical combination of two or more atoms from different elements is "compound molecules." Compounds are specific types of molecules that consist of two or more different elements that are chemically bonded together. This means that when elements combine to form compounds, they undergo a chemical reaction resulting in new substances that have unique properties different from the individual elements.

When referencing other terms in the context of this question, a molecule refers generally to a group of atoms bonded together, which can include both elements that are the same (like O2) and different. Pure substances are materials that are composed of only one type of particle, which can be either elemental or compound in nature, but do not specify the combination of different elements. Solutions describe a homogeneous mixture of two or more substances but do not indicate a chemical bond forming between different elements.

By understanding the definition of compound molecules, one can appreciate the significance of chemical bonding and the transformation of elements into new substances through their interaction.