#Webquest atomic theories and models series

What was the “plum pudding” model of the atom and its electrons? 'Plum pudding,' that is, it was roughly the same consistency throughout, with negatively-charged electrons scattered about in it like raisins in a pudding.ġ3. Rutherford and Bohr Break the “Plum Pudding” Model: Go to /dp13at.html and use the information found there to answer the following questions: 12.

What was the model of the atom he proposed in 1904? In 1904 Thomson suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces. Later he estimated the value of the charge itself.ġ1. He interpreted the deflection of the rays by electrically charged plates and magnets as evidence of 'bodies much smaller than atoms' that he calculated as having a very large value for the charge-to-mass ratio.

#Webquest atomic theories and models series

What was the evidence for “bodies much smaller than atoms”? Thomson in a series of experiments designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by numerous scientists at the time. Thomson discovered the electron? In 1897 the British physicist Joseph John (J. Thomson and the Electron: Go to and use the information there to answer the following questions: 9. 4) A chemical reaction is a rearrangement of atoms. 3) Compounds are formed by a combination of two or more different kinds of atoms. 2) All atoms of a given element are identical in mass and properties. Atoms are indivisible and indestructible. What are the four components of Dalton’s Atomic Theory? 1) All matter is made of atoms. When did Dalton form his Atomic Theory? Dalton publish is Atomic Theory in 1808.Ĩ. John Dalton’s Atomic Theory: Go to and use the information there to answer the following questions: 7. This gave rise to the alchemists (who searched for a way to turn lead to gold). How were the ideas of these two men received by Aristotle, and what was the result on the progress of atomic theory for the next 2,000 years? 350 B.C - Aristotle modified an earlier theory that matter was made of four “elements”: earth, fire, water, air. How did they use atoms to explain different physical properties? The different physical properties - color, taste, and so on - of materials came about because atoms in them had different shapes and/or arrangements and orientations with respect to each other.Ħ. What was the “basic idea” about matter that Leucippus and Democritus proposed? The basic idea was that if you could look at matter on smaller and smaller scales (which they of course couldn't) ultimately you would see individual atoms - objects that could not be divided further (that was the definition of atom).ĥ. Electrical Charge Negative Positive NeutralĮarly Ideas About Atoms: Go to and read the section on “Early Greek Ideas” in order to answer the following questions: 4. Location within the Atom Shells/Orbital’s around Nucleus Nucleus Nucleusģ. The 3 subatomic particles Electrons Protons NeutronsĢ.

What is the electrical charge of each particle? 1.

Where are each of the three particles located within the atom? 3. What are the three subatomic particles that all atoms are made of? 2. Atom Basics: Go to: and read the “And you thought you were strange” section to answer the following questions (put answers in the table). If you require more space, please complete on another piece of paper. Webquest: Atomic Theories and Models Answer these questions on your own, USING COMPLETE SENTENCES where appropriate (most of the questions, except tables and drawings).