In this model the blue circles represent protons and the green ones represent neutrons. It shows a free neutron colliding into a Uranium-135 atom which then splits into Barium-141, Krypton-92 and 3 Neutrons. This is only the very start of a certain scenario that could occur with the fission of Uranium-235. This model does not show the different scenarios that could occur, the size of the reaction, the size of the atoms, the size of the space between the atoms and particles, the speed of the particles and atoms, the possible directions of the atoms and particles and other minor details.
Uranium-235 does not have to split into Krypton-92 and Barium-141 it could split into two other elements e.g Caesium-140 and Rubidium-92. It also doesn’t need release three neutrons but this is the most common example and that is why it is shown. This wasn't shown because it was not completely important as it wasn’t needed to explain the fission process of Uranium-235.
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The Uranium-235 atom is bigger than the Krypton-92 and Barium-141 atom, the Barium-141 atom is slightly bigger than the Krypton-92 atom but it is not shown on a scale so therefore not accurate. The amount of neutrons and protons are not in a scale and therefore are also not accurate, except for the one at the start and the three at the end. This was not shown because it is not necessary, to show a combined 235 protons and neutrons, in the model as it wouldn’t really help the explanation. The only important part is that Krypton-92 and Barium-141 are smaller than Uranium-235. The space also isn’t relevant as that varies between each atom and doesn’t effect the reaction that much as well as the size of the reaction as it will just show the same reaction