Matter and change · Ages 9–12

Build matter from the inside.

Use particle models to explore what matter is made from and how its properties change.

Learning path

Start with one good question.

Can you build a neutral carbon-12 atom?

Foundation · 8 min

Change protons, neutrons, and electrons and watch the scanner update.

Foundation · 7 min

Select any element and connect its atomic number to its proton count.

Challenge · 9 min

Use particle clues to tell mixtures, solutions, and compounds apart.

Coming next

Learn by doing

This local prototype does not save progress. Retry as often as you like— mistakes are part of the lesson.

LiLithium

Simplified shell-style learning model—not to scale. Real electrons do not travel on little planet-like tracks.

Atomic scanner · Step 1

Change the number of protons until the scanner identifies carbon.

p+Protons

nNeutrons

e−Electrons

The number of protons decides the element.

Chemistry reference lab

Choose any of the 118 elements. Its atomic number tells you exactly how many protons are inside every atom of that element.

Swipe or scroll to explore all 18 groups.

12345678910111213141516171857–7189–103LanthanidesActinides

NonmetalAlkali metalAlkaline-earth metalTransition metalOther metalMetalloidHalogenNoble gasLanthanideActinide

Some element families can be classified differently. This table uses broad school-level groupings.

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