The model that the student base his research on is the structure of the atom as the total mass of the atom is evenly distributed throughout the atom. The correct option is D.
The atom is the smallest unit of matter. It is divisible and made up of charged particles. These particles are electrons, positively charged, proton, negatively charged, and neutrons neutral.
The mass of the atom is the total of its proton and electron, so the mass will be distributed throughout the atom.
Thus, the correct option is D, The total mass of the atom is evenly distributed throughout the atom.
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