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Chapter 4: Atomic Structure
The Atom
9
Chemistry
11th Grade
09/19/2007

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Term
Who was Democritus?
Definition
Democritus was a philsopher who first discovered the atom.
Term
What did he believe about the atom?
Definition
He believed that all matter consisted f extremely small particles that could not be divided.He thought there were different types of atoms with specific set of properties.
Term
Where does the work atom come from and what does it mean?
Definition
It comes from the greek work atomos. It means uncut and indivisible.
Term
Who was Aristotle?
Definition
Aristotle was another greek philosopher
Term
What did he think?
Definition
He thought that there wasnt a limited number of times matter could be divided.
Term
John Dalton
Definition
was born in England in 1766.He was teacher who spend his spare time doing scientific experiments.
Term
What was his evidence for atoms?
Definition
To get his evidence he measured the masses of elements that combine when compounds form.He noticed that all compounds have something in common.
Term
Dalton's Atomic Theory
Definition
- All elements are composed of atoms
- All atoms of the same element, have the same mass, and atoms of different elements have different masses.
- compounds contain atom of more that one element.
- In a particular compound atoms of different elements, always combine in the same way.
Term
What was Daltons main point in his theory?
Definition
That all matter is made up of individual particles called atoms, which cannot be divided
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