This interactive periodic table is built on the official IUPAC (International Union of Pure and Applied Chemistry) reference data, designed for middle- and high-school chemistry students, undergraduates in chemistry, life sciences and materials engineering, chemistry exam candidates, and science educators. It covers all 118 chemical elements from Hydrogen (H, #1) to Oganesson (Og, #118), presenting atomic number, atomic mass, electron configuration, group/period classification, electronegativity, ionization energy, melting point, boiling point, discovery year, discoverer, and primary applications. A signature feature is the real-time temperature slider (0 K to 6,000 K) that visually simulates each element's state of matter (solid, liquid, gas) across the full thermal range—a powerful learning aid for physical chemistry concepts. The Bohr atomic model visualization renders electron shells and orbitals, and an integrated speed quiz mode helps solidify memorization through spaced repetition. Note: columns (Groups 1–18) share outer-shell electron counts and thus chemical behavior, while rows (Periods 1–7) indicate electron shell count. Only Mercury (Hg) and Bromine (Br) exist as liquids at standard room temperature (25 °C / 298 K).