Free interactive chemistry · SIM-NUC-001
Radioactive decay
Radioactive nuclei decay at random. Together they follow the exponential half-life law.
Open the interactive simulation →How to use this simulation
- Choose an isotope or a decay chain.
- Set the number of nuclei and the time speed.
- Press play and watch nuclei change colour as they decay.
- Compare the counted curve with the exact law in “Graphs”.
What to notice
- No single nucleus has a timer; each has the same chance of decaying.
- Counts wobble by about √N around the smooth curve.
Try this
Use 512 nuclei, then 3375. Which follows the exact curve more closely?
Try it for free →