Atomic theories - PowerPoint PPT Presentation

EARLY Atomic theories

EARLY Atomic theories. democritus. The Greek philosopher Democritus (460-370BC) was the first person to propose the idea that matter was not infinitely divisible.

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Atomic theories and Valence Electrons

Atomic theories and Valence Electrons. Atomic Theories. Dalton thought that atoms were like smooth, hard balls that could not be broken into smaller pieces. Atomic Theories. Thomson suggested that atoms had negatively charged electrons embedded in a positive sphere. Atomic Theories.

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