Evidence of atomic structure
Lesson 3 / 12
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I can describe how alpha particles were used to show the size and nature of atomic nuclei.
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Background radiation is caused by unstable nuclei that are around us all of the time.
Atoms are very small with a radius of about 1 × 10⁻¹⁰ m.
The alpha particle scattering experiment (Rutherford, 1909) provides evidence for the size and nature of atomic nuclei.
An atomic nucleus has a radius about 10 000 times smaller than that of an atom.
Most of the mass of an atom is in its nucleus.
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