lecture 2 - Lecture 2 Chapter 2 Atoms, Molecules, and Ions...

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1 Chapter 2 Atoms, Molecules, and Ions Today’s reading: section 1 to section 7 Lecture 2 The Atomic Structure --- the Electron Cloud Model
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2 0.000549 9.110 x 10 -28 g -1 Electron 1.008701 1.6750 x 10 -24 g 0 Neutron 1.007316 1.6727 x 10 -24 g +1 Proton Mass (amu) Mass (g) Charge Particle Properties of Protons, Neutrons and Electrons Nuclear Symbolism Ag 47 107 Sy Z A Mass Number Atomic Number Chemical Symbol e.g.
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3 Example 1: How many protons, neutrons and electrons are there in an atom of 14 C? Average Atomic Mass (Atomic Weight) Average Atomic Mass = Σ (Abundance x isotope atomic mass) 19 K 39.0983 In periodic table: Atomic number Element symbol Atomic weight Example: if you analyze the diamond from your diamond ring, you would find that 98.9 % of 12 C atoms, and 1.11 % of 13 C atoms. So the weighted average mass of carbon is (0.989)(12.000000 amu 12 C ) + (.0111)(13.0039 amu 13 C ) = 12.011 amu
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4 Question: Lithium occurs in nature as a mixture of two isotopes: 6 Li and 7 Li. Their atomic masses are 6.015122 amu and 7.016003
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This note was uploaded on 04/07/2008 for the course CHEM 121 taught by Professor Wyzlouzil during the Fall '07 term at Ohio State.

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lecture 2 - Lecture 2 Chapter 2 Atoms, Molecules, and Ions...

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