Modern electron cloud model - PowerPoint PPT Presentation

The History of the Atom

The History of the Atom. From Democritus to Today’s Modern Theory. Democritus. 400 BC Proposed that all matter is made up of atoms. Thought atoms were small, hard particles of different shapes and sizes. Coined the term ‘Atom’ From the Greek word meaning ‘Can not be divided.’.

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Development of Atomic Theory

Development of Atomic Theory. 8 TH Grade. 1. Democritus (430 BC ) proposes the idea that matter is formed of small pieces that could not be cut into smaller parts. He called the small pieces “ atomos ” – Greek for uncuttable . 2. John Dalton’s Atomic Theory (1803)

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