Sept_07 - The Periodic Table Atomic Structure The number of...

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The Periodic Table
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Atomic Structure • The number of protons determines the element. Z = # protons (the atomic number) • The number of neutrons determines the isotope A = Z + # neutrons (atomic mass number) • Varying numbers of neutrons produce more than 1 isotope for many elements Example: carbon 12 is 6 12 C
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Isotopic abundance patterns are used to identify molecules by high resolution mass spectrometry
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Simple Binary Chemical Compounds Molecular Compounds - Usually formed by the combination of 2 nonmetallic elements. E.g. C(s) + O 2 (g) CO 2 (g) Ionic Compounds – Formed from the combination of a metallic element and a non-metallic element E.g. Na(s) + ½Cl 2 (g) NaCl(s)
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Chapter 5 – Structure of the Atom Suggested Textbook Problems: 5, 7, 9, 11, 33, 37, 39, 47
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c = ν λ λ = wavelength (m) ν = frequency (s -1 , Hz) c = velocity of light = 3.00 × 10 8 ms -1 Electromagnetic Wave Electromagnetic Radiation
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The Electromagnetic Spectrum ∝ 1
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Constructive Interference
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Sept_07 - The Periodic Table Atomic Structure The number of...

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