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contents

pg.1

     definition of atomic theory

pg.2-10

        people and facts

The theory that all matter is made up of tiny indivisible particles (atoms). 

Atoms are small and cant be seen with the naked eye except for under a telescope but even using that some 

you still cant see cause scientist haven't found them yet or found out how to find them.

He was a greek philosopher in the year 400 B.C. He used the word atoms to describe the 

smallest piece of matter. 

-Just a "thought experiment".

-Most of the stories about Democritus are worthless later inventions.

-The Greek natural philosopher Democritus (ca. 494-ca. 404 B.C.) promulgated the atomic 

theory, which asserted that the universe is composed of two elements: the atoms and the 

void in which they exist and move. 

-350 B.C.

-Did not buy into the atom theory.

 -Thought there were only four elements:

       air, fire, earth, and water.

-no one listens to Democritus.

-Aristotle did not believe in the atomic theory and he taught so otherwise.

-He believed all substances were made of small amounts of these four elements of matter.

- He also liked to walk around and teach so he had followers (students).

-Aristotle's view was finally proven incorrect and his teachings are not present in the 

modern view of the atom which democritus was the first to call.

-Considered to be the father of modern 

chemistry.

-He is credited with performing the 

first experiment that established the 

principle   of the law of conservation of 

mass.

LCM

-Mass is neither created nor destroyed 

during ordinary chemical reactions or 

physical changes.

proposed the first atomic theory in 1803.

1> all elements are composed of indivisible particles.

2> atoms of the same element are the same.

3> atoms of different elements are different.

4> compounds are formed by joining atoms of two or more elements.

- The english scientist who discovered 

electrons in 1897.

- He did the cathode ray tube 

experiment.

-He created the plum-pudding model.

- he says that electrons float in a "sea 

of positive charge" and mass is evenly 

dispersed.

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