Explore elements, species, reactions, solution chemistry, electrochemistry, and mineral-forming components.
Element & species search
Alkali metal
Alkaline earth
Transition metal
Post‑transition
Metalloid
Nonmetal
Halogen
Noble gas
Lanthanide
Actinide
Tip: Drag tiles into the Reaction Box to combine them. Right‑click a tile for quick info.
View Options
Reaction Box
Drop elements here…
Prediction transparency
Rule not evaluated
Product identity—
Atom balance—
Real-world occurrence—
Conditions
Drop conditions here…
Equation Workbench
Enter a molecular or net-ionic equation. Use spaces around separator plus signs; charges may remain attached to formulas.
Shared reaction state ready.
Compound Explorer
Stoichiometry
Uses the balanced equation above. The selected source is treated as the limiting reactant at 100% theoretical yield.
Element Comparison
Compare up to four elements side by side. The explanation highlights group and period trends rather than merely listing values.
Isotope & Nuclear Lab
Electron Structure Lab
Mineral Builder
Build a charge-balanced binary mineral formula, or load a mixed-composition mineral recipe. A formula match identifies candidates; it does not prove crystal structure or polymorph.
Saved Experiments & History
Snapshots preserve reactants, conditions, reaction mode, workbench entries, table view, comparison selections, and the current element. Data stays in this browser unless exported.
Recent activity
Export Center
Copy or download the current result in formats suited to notes, reports, presentations, and Obsidian.
Quiz & Challenge Mode
Score: 0/0Streak: 0Best: 0
Choose a challenge and press “New question.”
Reaction Rule Database & Inspector
The prediction engine now exposes the formal rule that matched, its priority, assumptions, limits, and confidence scores. Rules are ordered from specific chemistry cases to cautious fallbacks.
Select two species to inspect the matched rule.
Automated Regression & Diagnostics
Run the same safety checks used during development. The full suite evaluates every unique element/ion pair, all supported ionic electron configurations, the equation balancer, mineral formulas, rule coverage, and core UI invariants.
StatusNot run
Passed0
Failed0
Checks0
Duration—
No test report yet.
Element info
Symbol—
Atomic #—
Name—
Category—
Period, Group—
Common valences—
Phase @ STP—
Natural/Synthetic—
Electron configuration—
Valence electrons—
Atomic mass—
Electronegativity—
Covalent radius—
van der Waals radius—
Notes & Limits
• Predictions are educational heuristics; they do not replace thermodynamic, kinetic, equilibrium, or laboratory analysis.
• Metal + nonmetal → predicts an ionic binary formula via charge cross.
• Nonmetal + nonmetal → common products are shown only where defensible; otherwise the tool reports uncertainty.
• Noble gases are treated as inert; metalloids prefer covalent/network solids.
• Diatomics: H, N, O, F, Cl, Br, I default to X2 when alone.
• Variable-valence metals show alternatives where possible; actual products depend on conditions and phase stability.
• v10.5 adds aqueous electrolyte analysis, complete and net ionic equations, amphoteric/complex-ion chemistry, separated thermodynamic and kinetic assessments, and a dedicated electrochemistry cell lab. v10.4 added canonical species and conservation validation.
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Atomic weights and radii use embedded reference values; superheavy-element radii are model-dependent. Missing electronegativity values are shown as unavailable.
Species Library v10.4
Search ions, acids, bases, gases, salts, solvents, and representative minerals. Click or drag any species into the Reaction Box.
Three or more selected species are evaluated as one reaction system—not as unrelated pairs. Assign roles directly on each Reaction Box chip.