Atomic model builder
Atom Atelier
Set protons, neutrons and electrons to create specified atoms, isotopes and ions.
8 missions · Developing · Untimed
Chemistry
Atomic composition, periodic positions and balanced symbolic equations.
4 activities · 32 guided missions · No account needed
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Conservation puzzle
Reaction Balance
Adjust whole-number coefficients while a live atom ledger checks both sides of each reaction.
8 missions · Developing · Untimed
Element mapping
Periodic Navigator
Locate the first twenty elements by their symbols, atomic numbers, groups and periods.
10 missions · Foundation · Untimed
Applied reasoning
Matter Mapper
Six applied problems with plausible alternatives and worked explanations.
6 missions · Stretch · Untimed
Practice, with a little more purpose.
Work without a countdown. Try the model, use a hint, then read the explanation. Checkpoints and practice records stay on your device. Teaching tools create shareable activity playlists and printable worksheets with answer keys.
These are original practice activities, not an accredited course or a secure assessment. Difficulty labels are editorial, not formal grade alignment. Science activities use explicitly simplified models. Playing requires JavaScript; this directory does not. See each activity's reference and model limits.