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History of the Atom

What did William Crookes discover? Cathode Rays
True or False: Cathode Rays come from the Anode False
Are Cathode Rays positive or negative? Negative
Cathode rays are invisible. Identify 3 more things we know about Cathode Rays 1.They fluoresce when they hit glass 2. They travel in straight lines 3. They have enough energy to make a paddle move
Who discovered the electron? JJ Thompson
Who identified the ratio of charge to mass (e/m) of the electron JJ Thompson
Describe the plum pudding model of the atom proposed by JJ Thompson A mass of positively charged material with small negative charges (electrons) embedded in it.
Who worked with Cathode Rays first, Crookes or Thompson? Crookes; Thompson followed on from Crookes' work
What did Robert Millikan calculate? The charge on an electron
What did Millikan charge in order to measure the charge of an electron? Oil drops
State the 3 assumptions of Dalton's Atomic Theory 1. All matter is made of very small particles 2. Atoms are indivisible, they cannot be broken down 3. Atoms cannot be created or destroyed
Name the scientist who discovered the nucleus Rutherford
What experiment did Rutherford carry out? Shot alpha particles at a thin sheet of gold foil
What was the expected result of Rutherford's experiment The alpha particles would pass straight through the atoms, with slight reflections
What was the actual outcome of Rutherford's experiment Some alpha particles were reflected at large anlges or back along their own path
What did Rutherford's experiment demonstrate? A dense core of positive matter existed in the centre of each atom- the nucleus!
What was Rutherford's second discovery? The proton
How did Rutherford discover the proton? Bombarded many elements with alpha particles and positive charges were emitted from the nuclei of lighter elements
Who discovered the neutron? Chadwick
Created by: Laura_Rice
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