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Rev. Notes > IGCSE > The Nuclear Atom
 
 
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The structure of an atom Rutherford's atomic model The nucleus
The proton number The nucleon number
 

Rutherford's atomic model

At the begining of 20th century, scientists knew that the atom contained positive and negative charges, but the structure was a great mystery.

An experiment by Rutherford discovered, what is now called Rutherford scattering experiment. 

(The actual work was done by two of his students, Gieger and Marsden)

 

What they discovered was that almost all of the alpha particles go through the thin metal sheet with no difficulty.

Perhaps one particle in a million was scattered by a relatively massive object that sent it off at a wider angle, and perhaps even back the way it had come.

This told them that the atom consists of a nucleus that contains almost all of the mas of the atom, because very few alpha particles were scattered by the nucleus so it had to be extremely small surrounded by a cloud of extremely light electrons.

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Diaf Said :
Very good notes
------------------------------------------------------------------------------------- Admin Replied:

Thanks 

 
  10/01/12 11:50 AM
 

 

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