อัปเดตเมื่อ Nov 13, 2026
• NEW Electron Builder: fill orbitals one electron at a time, learn the Aufbau principle, Hund's rule and the Pauli principle, and collect stars for all 118 elements.
• 4 new calculators: stoichiometry (limiting reactant, yield), dilution, pH and gas laws, each with step-by-step working.
• Compare two elements side by side and explore periodic trends charts.
• Share an element card.
• Better tablet layout; Privacy Policy and Terms links.
