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The Solid Sphere Model was the first atomic model and thats thanks all to John Dalton in the 19th century. He said that an atom is a solid sphere that could not be divided into smaller particles.
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Atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges.
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Well known gold experiment where he demonstrated that the atom has a tiny and heavy nucleus. Designed an experiment to use the alpha particles emitted by a radioactive element.
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Positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus. Similar to structure of the Solar System
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Math equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom
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I did not know how to add the date so i made it onto the timeline... unless that is how's was supposed to be. (: