Atom Builder

What you learn

Simulation Ages 12–16

Add protons, neutrons, and electrons to build atoms of each element.

Notes

This simulation only provides tools for building atomic models and does not determine whether the completed atomic model is stable.
For every number of protons (atomic number), there is a range of neutron counts that allows an atom to remain stable. Atoms with an unsuitable number of neutrons undergo radioactive decay in an…

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Getting your lab ready…

Warming up the lab…

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Tips

How to play

Read the instructions

Drag particles onto the nucleus (center) or electron shells. Check atomic number and charge.
Click things
Press buttons

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Credits & source

This sim comes from free teaching tools at Javalab.org. We adapted it so you can play offline.

View original on Javalab