nucleus

phet.colorado.edu

How did Rutherford figure out the structure of the atom without being able to see it? Simulate the famous experiment in which he disproved the Plum Pudding model of the atom by observing alpha particles bouncing off atoms and determining that they must have a small core.

phet.colorado.edu

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.