Periodic Navigator

Locate the first twenty elements by their symbols, atomic numbers, groups and periods.

5–15 min 1 learner

How it works

1. Inspect a clue card, then select a position in the first-twenty-elements map. Reference mode labels positions without pretending it is a test.
2. Read the explanation after each mission. Hints are always available.
3. Choose any mission or resume a local checkpoint. Progress is practice history, not a certified grade.

Controls: Keyboard / tap / labeled controls

Open Periodic Navigator

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