Review_Chapters_1-10

Review_Chapters_1-10 - Final Exam Dec. 20, 1:10 3:30PM...

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37 REVIEW (Chapters 1-10) Final Exam Dec. 20, 1:10 – 3:30PM MR-1, -2, -3 1. Atomic Structure and Properties 2. Molecule Structure and Chemical Bonds 3. Reactions and Stoichiometry 4. Energies and Thermochemistry 38 1. Atomic Structure and Properties 1.1 Atoms and Periodic Table Nucleus and electrons Nucleus is composed of protons and neutrons. Atomic number (Z) = # of protons in the nucleus of an atom of an element. Mass number (A) = number of protons + number of neutrons An atom is electrically neutral; number of protons = number of electrons In periodic table, elements are arranged by increasing atomic number (Z). Atoms that have the same number of protons but different numbers of neutrons are called isotopes of an element. A E Z Chemical symbols for isotopes 35 Cl 17 35 Cl Simplified form:
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39 Atomic mass One atomic mass unit (u) = 1/12 the mass of a C-12 atom. Atomic mass listed in the periodic table is the weighted average Atomic mass = fractional abundance × mass of isotope 1 + fractional abundance × mass of isotope 2 + … It is also numerically equal to the molar mass (g/mol) of an element: Mass (in g) of N A atoms of an element Mass of an atom (g) = molar mass / N A Electrons in atoms Four quantum numbers: n , l , and m l , and m s . Atomic orbitals: s , p , d , f ( l = 0, 1, 2, 3) Electron configuration (both spdf notation and orbital diagram ) Valence shell and valence electron Main group elements: group number = number of valence electrons All elements: periodic number =
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This note was uploaded on 05/06/2008 for the course CHEM 103 taught by Professor Forgot during the Spring '07 term at CUNY City.

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Review_Chapters_1-10 - Final Exam Dec. 20, 1:10 3:30PM...

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