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"**Leucippus**." Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 18 Oct. 2009 < http://www.britannica.com/EBchecked/topic/337658/Leucippus >. [] []

Democritus: [] Kanada: [] Daltons model: [] Dalton : [] Roentgen: [] Ruhterford: [] Chadwick: [] Bohr: []