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Democritus 400 BC. Ancient Greek philosopher who thought that matter was made of small indivisible particles. He name them “atoms” which means indivisible in Greek. John Dalton 1830. Agreed with Democritus model of the atom and Added to Democritus idea.

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Presentation Transcript
slide2
Ancient Greek philosopher who thought that matter was made of small indivisible particles. He name them “atoms” which means indivisible in Greek
slide5
Agreed with Democritus that matter was made of small indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere
slide6
He created an atomic theory that consisted of 4 parts1) Chemical elements are made up of atoms. 2) The atoms of an element are identical in their masses. (Be sure students understand that this was shown to be false with the discovery of isotopes.) 3) Atoms of different elements have different masses. 4) Atoms only combine in small, whole number ratios such as 1:1, 1:2,
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Used a cathode ray tube to discover electrons (negative particles)Thought the negative particles were mixed in the positive charge like raisins in plum pudding
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Thought that the atom is mostly empty space.(football stadium model)discovered the nucleus by doing an experiment with gold foil

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Thought that electrons orbit the nucleus like planets orbit the sun. We still draw atoms like this today.

slide18
States that electrons don’t stay in fixed orbits. They can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade
slide19

First energy level can have 2 electronssecond can have 8third can have up to 18 (but it prefers 8) and the 4th can have up to 32

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Negative chargefound in the electron cloud surrounding the nucleustakes almost 2000 of them to weigh as much as one proton or neutron

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