Scientists aimed to answer the question of atomic structure through further experimentation, observation, and the development of theoretical models.
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The significant question was what kind of structure the particles of the atom formed.
Protons were believed to be located in the interior of the atom because electrons could be easily removed from atoms, but protons could not.
Initially, it was understood that atoms were composed of protons and electrons, with their charges balancing each other out.
The mass of an electron is considered negligible compared to other sub-atomic particles such as protons.