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Used the term "atom" (Invisible) for the firts time.
"Matter was made uo tiny individual particles called atoms. Atoms could not be created, destroyed and further divided.

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"Spherical atom"
"Bill and ball model"
-All matter is made up of tiny particles called atoms. Atoms are indivisible and indestructible.
-Atoms of a given element are identical in size, mass, and chemical properties. Atoms of a specific element are different form those of another element.
-Atoms of two or more differenr elements combine to form compounds.
-A chemical reaction involves the rearrangement, separation, or combination of atoms.

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"Plum pudding model"
-Discovered e- (electrons) using cathode rays.
-Atoms are positive spheres with e- (electrons) on the surface.
-Atoms are neutral, thus the sphere contains the same quantity of positive and negative charges.

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"Nuclear Atom"
Discover protons Gold foil experiment:

A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. Some particles had their paths bent at large angles. A few even bounced backward. The only way this would happen was if the atom had a small, heavy region of positive charge inside it.

-Realized positive charge was located in the nucleus of an atom

-He stated that electrons revolve around the nucleus in a circular path, but particles in motion would undergo acceleration and cause energy radiation.

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"Solar System"
-Electrons move around the nucleus in circular orbits called: energy levels

-Proposed stable electron orbits and explained the emission spectra of some elements.

-Moving electrons should emit energy and collapse into the nucleus, and his model did not work well for heavy atoms.

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"Quantum mechanics model"
"Electron cloud"
-Is impossible to know the location of an electron, but we can predict it.

Levels–Sublevels–Orbital

-Show´s electrons don't move around the nucleus in orbits, but in clouds where their position is uncertain.

-Still widely accepted as the most accurate model of the atom.