Science atomic theory
Storyboard Text
- Hi I am Lucas and I am going to take you through the history of the ATOM
- present day
- SCIENCE
- 460 BC
- Hi I am Democritus
- All matter consists of atoms, which cannot be further subdivided into smaller particles.
- 1766
- Hi I am John Dalton and All matter is comprised of tiny, definite particles called atoms.Atoms are indivisible and indestructible.All atoms of a particular element share identical properties,
- 1831
- Hi I am Michael Faraday and Atoms have an electrical component. Electrical forces are responsible for the joining of atoms in compounds.
- He thought that a point would be reached at which the cheese could not be cut into still smaller pieces. He called these pieces atomos, which means “uncuttable” in Greek.
- 1897
- He also believed that all compounds were composed of combinations of these atoms in defined ratios.Dalton also postulated that chemical reactions resulted in the rearrangement of the reacting atoms.
- 1911
- Hi I am Ernest Rutherford. the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. The nucleus is positively charged and surrounded at a great distance by the negatively charged electrons.
- his discovery was crucial in allowing electricity to be transformed from a curiosity into a powerful new technology.
- Faraday’s earliest experimental observations was a crucial precursor to the discovery of the first subatomic particle, the electron.
- He discovered the electron and then went on to propose a model for the structure of the atom. His work also led to the invention of the mass spectrograph.
- Hi I am JJ Thomson andAll atoms contain tiny negatively charged subatomic particles or electrons.
- Although proven wrong Thomson's model was correct at the time, because it explained all that scientists then knew about the atom.
- He also built the model of the atom that we all know today. He had the negatively charged electrons surround the nucleus of an atom.
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