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- Democritus was an ancient Greek pre-Socratic philosopher around the year 460 BC. He claimed that if you cut a piece of cheese into little bits there is a point where it becomes uncuttable. He named these uncuttable objects atomos.
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- I believe that there is a basis for all matter. If I were to cut a piece of cheese into smaller pieces there must be a point where it becomes uncuttable.
- John Dalton was an English Chemist in the Year 1808. He figured out that atoms are indivisible objects that make up everything in the world. He claimed that atoms from the same element are the same size and weight.
- Atoms are the building blocks for everything in the universe. They cannot be created or destroyed.
- Michael Faraday was an English Chemist in 1830. He claimed that atoms can gain an electrical charge. His background in electro magnetism helped him discover these things.
- He discovered that atoms can gain an electrical charge. This allows the atoms/elements to create compounds
- J.J. Thomson was an English Physicist in 1898. He was the one that discovered that atoms are tiny negatively charged subatomic particles. His discovery changed the way people thought about electrons and helped make sense to the discoveries before. He also discovered electrons. He utilized the Raisin Bun Model.
- Every Hydrogen atom has a single electron. Electrons can be added and taken away from atoms.
- Ernest Rutherford is a New Zealand-born British physicist in 1911 who was responsible for the discovery of the nucleus within the atom. He discovered this by by bombarding a thin gold sheet with the alpha particles emitted by radium
- Atoms are mostly empty space with most of it's mass packed in a tiny package in the centre called the nucleus.
- Niels Bohr is a Danish physicist in 1913. Mr Bohr made a massive contributions to the atomic theory by discovering that electrons can only exist in shells for atoms and only a certain amount can be in each shell. He used his discovery to explain the spectral lines in Hydrogen. He created a model called the Bohr Model.
- There can only be 2 electrons in the first shell, 8 in the second, and 18 in the third.
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