Protons, neutrons and electrons you can move by hand: build an element, weigh an isotope, make an ion, fill the orbital boxes yourself, strip electrons one at a time to find the jump, and see the shapes the electrons actually occupy.
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Runnable now
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Offline ready
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In development
What this section will hold
These simulations are catalogued but not built yet, so nothing here pretends to work. Each one appears the moment its renderer ships.