BMB 207 Lecture Notes - Lecture 12: Alpha Particle, Alkaline Earth Metal, Atomic Number
29 Oct 2016
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Notes: noble gases are in 8a, halogens (except h) are in group 7a, alkaline earth metals are in group 2a, alkali metals (except h) are in group 1a, structure of the atom. Narrow beam of alpha particles impinge on a thin metal foil and the angle of the scattered particles is counted. Most particles pass through the gold foil with little or no de ection by the substance of the foil. A few particles are de ected by the foil by angles up to 180 degrees (i. e. , back toward the source. ) Knowing the properties of his alpha particle bullet (mass, charge, kinetic energy), the relative number and degree of de ections, a few assumptions and some math rutherford concluded: The atom is not a sphere of uniform mass and charge density as was previously proposed. The mass of the atom is concentrated in a very small portion of the total volume of the atom.
