date:______ models of the atom homework - answers use the link below to answer the following questions: http://www.universetoday.com/38326/plum-pudding-model/ 1. who proposed the plum pudding model? 2. in the plum pudding model of the atom, what do the plums represent? 3. in this model, what does the dough represent? 4. what major step does the plum pudding model represent in terms of atomic research? 5. how is this model different from modern modes of the atom? 6. briefly describe the apparatus thomson used in his experiments. 7. describe what thomson observed during his experiments. 8. thomson named the particles he discovered during his experimentation ‘corpuscles’. what we now know these particles as? 9. what awards did thomson receive for his work on the atom?

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To answer these questions, we refer to the provided link (http://www.universetoday.com/38326/plum-pudding-model/) or atomic theory knowledge:

### 1. Who proposed the plum pudding model?
Brief Explanation: J.J. Thomson proposed the plum pudding model.
Answer: J.J. Thomson

### 2. In the plum pudding model, what do the plums represent?
Brief Explanation: In the model, plums represent electrons (negatively charged particles).
Answer: Electrons (negatively charged particles)

### 3. In this model, what does the dough represent?
Brief Explanation: The dough represents the positively charged “soup” or matrix in the atom.
Answer: The positively charged “soup” (or the positive charge distribution in the atom)

### 4. What major step does the plum pudding model represent?
Brief Explanation: It was the first model to include subatomic particles (electrons) and recognize atoms are not indivisible.
Answer: It was the first model to incorporate subatomic particles (electrons) and show atoms are not indivisible.

### 5. How is this model different from modern models?
Brief Explanation: Modern models (e.g., Bohr, quantum) have a nucleus with protons/neutrons, and electrons in orbitals. The plum pudding model has no nucleus, with electrons scattered in positive charge.
Answer: The plum pudding model lacks a nucleus; modern models have a nucleus (with protons/neutrons) and electrons in defined orbitals/shells.

### 6. Briefly describe Thomson’s apparatus.
Brief Explanation: Thomson used a cathode ray tube (CRT) with electrodes. He applied voltage, observed ray deflection with electric/magnetic fields.
Answer: He used a cathode ray tube (CRT) with electrodes. He applied voltage to produce rays, then used electric/magnetic fields to deflect them.

### 7. What did Thomson observe?
Brief Explanation: He observed cathode rays (electrons) deflected by electric/magnetic fields, showing they are charged particles.
Answer: He observed cathode rays (electrons) deflected by electric and magnetic fields, proving they are charged particles.

### 8. What are Thomson’s “corpuscles” now known as?
Brief Explanation: Thomson’s “corpuscles” are now called electrons.
Answer: Electrons

### 9. What awards did Thomson receive?
Brief Explanation: Thomson received the Nobel Prize in Physics (1906) for his work on electrons.
Answer: Nobel Prize in Physics (1906) (and other honors like knighthood).

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1. Who proposed the plum pudding model?

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2. In the plum pudding model, what do the plums represent?