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Democritus proposed that if you kept cutting a substance in half forever, eventually you would end up with an “uncuttable” particle.

He called these particles “atoms”, meaning “indivisible” in Greek.

Democritus thought that atoms are small, hard particles.

Democritus thought that atoms were always moving.

Democritus thought that atoms were formed different materials by combining with each other.

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Scientists who knew that elements combined with each other in specific proportions to form compounds.

He claimed that the reason for this was because elements are made of atoms.

He published his own three-part atomic theory as follows: 1.)All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed.    2)  Atoms of the same element are exactly alike, and atoms of different elements are different.                           3)  Atoms join with other atoms to make new substances.

Much of Dalton’s theory was correct, but some of it was later proven incorrect and revised

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He experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.

Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup."

Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.

Based on these results, Rutherford proposed the nuclear model of the atom.

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He conducted the gold foil experiment.

Then realized that the plum-pudding model of JJ Thomson didn’t explain his observations

So, he change the atomic theory and developed a new model of the atom.

A region in the center is called the nucleus.

The tiny, extremely dense, positively charged region.

Atoms contain mostly empty spaces.

The electrons travel in random paths around the nucleus.

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He proposed that electrons move around the nucleus in specific layers, or shells.

Electrons travel in definite path at certain level from the nucleus but it can't travel between the path but can jump from one to another

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Atom didn't travel in the definite paths

Electron can't be predicted

Electron are found in electron cloud(Regions inside an atom )