Conceptual

Ionic vs Molecular Compounds and Atom Ion Definitions in Chemistry

In chemical classification theory, substances are categorized based on particle composition (single atoms versus multiple bonded entities) and elemental homogeneity to distinguish pure elements from compounds. The domain defines distinct ontological categories: particles with a single atom or identical atomic types constitute molecules or pure elements, while combinations of differing atomic types form compounds distinguished further by bond mechanisms where electron sharing characterizes covalent structures and electrostatic attraction between metal cations and nonmetal anions characterizes ionic lattice structures.