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Use the theme menu (top right) to change the colour scheme. It is remembered across all tools.
⚛️
Build Atoms & Ions
Place electrons in shells for the first 20 elements and build neutral atoms or ions. Guided or Test mode.
Open → 🔗Covalent Bonding
Draw dot-and-cross diagrams so every atom has a full outer shell. Guided or Test mode.
Open → ⚡Ionic Bonding
Given a compound name, work out the formula and build each ion with electrons and charges.
Open → ⚪Particle Diagrams
Solids, liquids and gases, with a heat-it-up view and atoms or molecules.
Open → ⚖️Equilibrium Demonstration
Watch counters flip between states and see a dynamic equilibrium emerge.
Open → 💧Solubility Checker
Quick-fire quiz: is this salt soluble in water? Includes a rules table.
Open →