Chemistry Reinterpreted: An Entropy–Decay Framework and a Three-Dimensional Periodic Table

This paper extends the entropy–decay hypothesis, previously applied to physics and cosmology, into the field of chemistry. We propose a three-dimensional periodic mapping in which matter is classified not only by atomic number but by entropic band (X), trapped entropy density (Y), and τ-resonance (Z). This approach allows isotopes, compounds, and post-reaction substances to occupy their own positions, overcoming limitations of the conventional periodic table. Worked examples—including the magnesium–water reaction, flammability of hydrocarbons, and transparency of glass and diamond—demonstrate how reactions can be interpreted as entropic trajectories rather than static exchanges. While current datasets rely on thermodynamic and spectroscopic proxies, the framework suggests a path toward more precise classification once τ-frequency can be measured directly. The work does not replace conventional chemistry but expands it, pointing to new ways of understanding matter, resonance, and transformation under the same entropy–decay hypothesis that has been used to reinterpret physics and cosmology.