isotopes
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Resources
PhET: Build an Atom
Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!
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PhET: Isotopes and Atomic Mass
Are all atoms of an element the same? How can you tell one isotope from another? Use the sim to learn about isotopes and how abundance relates to the average atomic mass of an element.
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PhET: Build a Nucleus
How does changing the number of neutrons or protons affect the nuclear species, the stability of a nucleus, and its possible decay mechanisms? Explore different species, and learn about the common decay paths! Visualize these through the chart of the nuclides and discover the inner energy levels of the nucleus.
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