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Q & A: Sizes of atoms and nuclei

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Most recent answer: 10/22/2007
What is the size not mass, of a silicon atoms nucleus compared to itís total size? Thanks
- Derek
Colby WI USA
Rutherford first measured the sizes of nuclei by scattering alpha particles from a gold foil.  See for an explanation.  The size of a silicon nucleus is of the order of 0.117 nanometers. 

The sizes of atoms were first estimated with the use of Avogadro's number along with the atomic mass and bulk density of a solid material. 
The number for silicon is about 100 picometers: see


(published on 10/22/2007)

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