For teachers
One concept per screen. Simplified shell models show electron counts, not literal electron paths or scale. Selected main-group examples only; the octet pattern is not universal. Removing an electron always requires energy. Favorable ion formation depends on the overall reaction, including interactions with other particles. Neon is described under ordinary chemical conditions, not in an energized discharge tube.
Object images are AI-generated illustrations of bulk materials. Atom diagrams are drawn in code. Motion stops within five seconds and respects reduced-motion settings. Progress is saved only in this browser tab. The 10-question classroom test requires 80%; this is a learning certificate, not a proctored credential. No student data is sent to a server.