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The Solid Sphere Model was the first atomic model and was developed by John Dalton in the early 19th century. He hypothesized that an atom is a solid sphere that could not be divided into smaller particles.
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Thomson had discovered that atoms are composite objects, made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom.
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an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure.
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the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
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The Quantum Mechanical Model of the Atom. Energy Is Quantized. After Max Planck determined that energy is released and absorbed by atoms in certain fixed amounts known as quanta,