Who proposed the first modern scientific atomic theory?, John Dalton, What did Dalton picture an atom as?, A solid, indivisible sphere, According to Dalton, all matter is made of what?, Atoms, According to Dalton, atoms of the same element are…, Identical in their properties, How do atoms form compounds according to Dalton?, They combine in whole-number ratios., What happens to atoms during a chemical reaction according to Dalton?, They are rearranged., Which scientist discovered the electron?, J. J. Thomson, What experiment helped Thomson discover the electron?, Cathode-ray tube experiment, What charge does an electron have?, Negative, What was Thomson's atomic model called?, Plum pudding model, What did Thomson's model add to Dalton's model?, Electrons inside the atom, Which scientist performed the gold-foil experiment?, Ernest Rutherford, What happened to MOST alpha particles in Rutherford's experiment?, They passed straight through the foil., What did Rutherford conclude from the gold-foil experiment?, Atoms are mostly empty space., What is found at the center of Rutherford's atom?, A small, dense, positive nucleus, Which scientist proposed electrons occupy specific energy levels?, Niels Bohr, In the Bohr model, electrons are found in…, Specific energy levels, What happens when an electron moves to a higher energy level?, It absorbs energy., What happens when an electron drops to a lower energy level?, It releases energy as light., Which model helps explain the colors produced by neon signs?, Bohr model, Which scientist developed the Uncertainty Principle?, Werner Heisenberg, What does Heisenberg's Uncertainty Principle say?, We cannot know an electron's exact position and momentum at the same time., In the modern atomic model, are electrons traveling in exact circular paths?, No, How does the modern model describe an electron's location?, As a probability or electron cloud, What is the modern atomic model often called?, Quantum mechanical model, What does an electron cloud represent?, Where an electron is likely to be found, Put the models in order: Bohr, Dalton, Rutherford, Thomson, Heisenberg., Dalton → Thomson → Rutherford → Bohr → Heisenberg, Which model first included subatomic particles?, Thomson's model, Which model first included a small, dense nucleus?, Rutherford's model, Which model introduced specific electron energy levels?, Bohr's model, Which model uses probability instead of exact electron paths?, Modern quantum model, Dalton → Thomson: What major idea changed?, Atoms contain electrons., Thomson → Rutherford: What major idea changed?, Positive charge and mass are concentrated in a nucleus., Rutherford → Bohr: What major idea changed?, Electrons occupy specific energy levels., Bohr → Modern Model: What major idea changed?, Electrons are described by probabilities, not fixed paths., Why has the atomic model changed over time?, New experimental evidence led scientists to revise the model.

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