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The blue dots are neutrons. The red and black balls are atoms. The black atoms are black to show that they have already reacted and are not as reactive. The yellow rays are gamma rays (high energy light) that are sometimes given off. When a neutron hits an atom, it can be absorbed or it can cause the atom to react to cause it to divide (fission).
The chance of reaction, absorption, or a gamma ray being given off is based on approximations of the real chances.