ELECTRONS 85 



Uranium, a chemical element of which the atomic 

 nucleus has an excess of ninety-two protons, has a most 

 unstable internal situation. Every little while some 

 atom of uranium will yield to the strain and expel from 

 its nucleus a whole group of protons and electrons, 



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From "Letter, of a Radio- 



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John Mills. Published by 

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closely associated and forming the so-called alpha par- 

 ticle. When it has done so the nucleus contains four 

 less protons and two less electrons, making a net excess 

 of ninety. During the process the number of planetary 

 electrons is reduced from ninety-two to ninety, to cor- 



