3-1 Early Models of the Atom. Atoms? ► The Greek Philosopher Democritus  Proposed that all matter is made up of small indivisible particles  Called.

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Presentation transcript:

3-1 Early Models of the Atom

Atoms? ► The Greek Philosopher Democritus  Proposed that all matter is made up of small indivisible particles  Called these “atomos” = atoms  Today’s Definition- The smallest particles of an element that retains the chemical identity of that element.

► Ancient Greeks rejected his ideas ► What holds these particles together?  Democritus could not answer, and his ideas were rejected.  Remained rejected until the 17 th century when observations could be made.

1700’s ► Lavoisier  Law of Conservation of matter ► Joseph Louis Proust  Law of constant composition  A compound always contains the same elements in the same proportions by mass.

John Dalton ► Each element is composed of extremely small particles called atoms ► All atoms of an element are identical, but they differ from those of other elements ► Atoms are neither created or destroyed in a chemical reaction ► A compound always has the same relative numbers of atoms.

► John Dalton launches us into experimentation about what exactly an atom is.