Atoms, Ions & Isotopes Builder

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About this simulation

Build an atom with protons, neutrons and electrons. Discover what changes its element, isotope and charge.

What students can explore

Start with carbon-12. Add a neutron, then remove an electron. Which properties change?
A counting model for the first ten elements: shells hold 2 then 8 electrons. Rings are not electron paths. Nuclear size is exaggerated; arbitrary combinations may be unstable.

Learning objectives

1Start with carbon-12. Add a neutron, then remove an electron. Which properties change?

Questions teachers ask

Start with carbon-12. Add a neutron, then remove an electron. Which properties change?

Six protons still identify carbon. A neutron changes mass number from 12 to 13. Removing one electron gives charge +1.

About the model

A counting model for the first ten elements: shells hold 2 then 8 electrons. Rings are not electron paths. Nuclear size is exaggerated; arbitrary combinations may be unstable.

Embed this simulation

Drop it into your LMS, blog, or class site — free.

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From model to evidence

Use a worksheet to capture predictions, observations, and explanations after students explore.

Identify isotopes

Worksheets

hard

Ages 14–18

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