CHEM 1000 Lecture Notes - Lecture 4: Spontaneous Emission, Radiography

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17 Nov 2017
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Chapter 3: Atomic Structure
Sections 3.1-3.5 (Early Discoveries; Protons, Neutrons, Electrons; Isotopes)
Thomson (1897): Discovery of Electrons
Opposites attract
Roentgen (1895): Discovery of X-rays
Electromagnetic Radiation
Becquerel (1895): Discovery of Radioactivity
Spontaneous emission of radiation form certain unstable elements
Three types of Radioactivity
Alpha: Greek Letter: α Mass (u): 4 Charge: 2+
Beta: Greek Letter:  Mass (u): 1/1837 Charge: 1-
Gamma: Greek Letter:  Mass (u):0 Charge: 0
Rutherford (1911)
Nuclear Theory of the Atom
Protons in Nucleus (1.672 x 10-27 kg)
Chadwick (1932): Discovered particle with about the same mass as proton but with no
electrical charge (Neutron)
Atomic # - Number of protons (Determines the identity of an element
Isotopes: Same number of protons; different number of neutrons
Same atomic #, different mass #
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