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==History of the Atomic Model==

==History of the Atomic Model==

The early Greek philosophers [[Democritus]] and [[Leucippus]] first proposed that all matter in the universe consisted of particles, which are the smallest units of [[matter]], though [[Aristotle]] used his fame to convince the [[scientific community]] that matter consisted of various ratios of [[earth]], [[fire]], [[water]], and [[air]], which can exist in any quantity.  This mislead them for centuries.

The early Greek philosophers [[Democritus]] and [[Leucippus]] first proposed that all matter in the universe consisted of particles, which are the smallest units of [[matter]], though [[Aristotle]] used his fame to convince the scientific community that matter consisted of various ratios of [[earth]], [[fire]], [[water]], and [[air]], which can exist in any quantity.  This mislead them for centuries.

[[John Dalton]] developed a realistic atomic theory based on four principles:  that all matter is composed of atoms, that each element's atoms are of one size, atoms combine chemically to form compounds, and chemical reactions occur when atoms are joined or separated.  His theory relied on [[Antoine Lavoisier|Lavoisier's]] [[Law of the conservation of mass|Law of Conservation of Mass]] and [[Joseph Proust|Joseph Proust's]] [[Law of definite proportions|Law of Definite Proportions]].

[[John Dalton]] developed a realistic atomic theory based on four principles:  that all matter is composed of atoms, that each element's atoms are of one size, atoms combine chemically to form compounds, and chemical reactions occur when atoms are joined or separated.  His theory relied on [[Antoine Lavoisier|Lavoisier's]] [[Law of the conservation of mass|Law of Conservation of Mass]] and [[Joseph Proust|Joseph Proust's]] [[Law of definite proportions|Law of Definite Proportions]].