Chapter 4.1 – The Development of Atomic Theory 1.Democritus – - Greek philosopher, 4 th century BCE - suggested universe was made of indivisible units.

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Presentation transcript:

Chapter 4.1 – The Development of Atomic Theory 1.Democritus – - Greek philosopher, 4 th century BCE - suggested universe was made of indivisible units called atomos – means unable to be cut or divided - did not have any evidence - forgotten until 1700’s

Chapter 4.1 – The Development of Atomic Theory 2. John Dalton – - English school teacher, atoms could not be divided - all atoms of a given element were exactly alike - atoms of different elements could join to form compounds - developed the law of definite proportions – a chemical compound always contains the same elements in exactly the same proportions by mass

Chapter 4.1 – The Development of Atomic Theory 3.J.J. Thomson – - British scientist, studied cathode rays - experiments suggested cathode rays were negatively charged particles from inside an atom - discovered electrons – subatomic particles with a negative charge - proposed the plum-pudding model – electrons are spread throughout the atom

Chapter 4.1 – The Development of Atomic Theory 4.Ernest Rutherford – - British scientist, proposed most of the mass of the atom was concentrated at the atoms center - conducted gold-foil experiment - discovered the nucleus – the atom’s central region made up of protons and neutrons - Rutherford’s model – negative electrons orbit the positive nucleus