2_atomic_models_1.pptx - History of the Development of...

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Atomic Models History of the Development of From Ancient Greeks to nowadays… (all but Thompson & Rutherford are optional info but good to know)
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Models are often used for things that are too small or too large to be observed or that are too difficult to be understood easily
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In the case of atoms, scientists use large models to explain something that is very small. Models of the atom were used to explain data or facts that were gathered experimentally. Models are only theories until they are experimental tested.
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Greeks - Matter is made up of four basic ‘elements’ – air, earth, fire, water Dalton – All matter is made up of atoms, atoms are: Indivisible, the building blocks of matter Indestructible, tiny –the smallest unit of matter Atoms of an element are unique Compounds consisted of atoms of different elements combined together Thomson’s Model Atoms were a ball of positive stuff Included negative electrons floating around ~ “ Plum-Pudding” model The Atom is electrically neutral as charges are balanced Early Models: Note: Thomson discovered the electron
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