151F09_W7_LV_2_shortnew

151F09_W7_LV_2_shortnew - General Chemistry CHEM 151 Week 7...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 7
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UA GenChem 208 18.7 13.5 1.95 1.01 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) P Electronic configuration (full and condensed)? What is this element?
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UA GenChem 208 18.7 13.5 1.95 1.01 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) P [Ne]3s 2 3p 3 1s 2 2s 2 2p 6 3s 2 3p 3
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UA GenChem The Quantum Mechanical Model of our particles correctly predicts: Line spectra for individual atoms The organization of the periodic table Trends in 1 st ionization energies Trends in the size of atoms Magnetic behavior of individual atoms And more to come… Summary
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UA GenChem Atomic Size Atomic Size
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UA GenChem .                                                           Decrease                                                            WHY ? WHY ? Trends: Atomic Size Trends: Atomic Size
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UA GenChem Your Turn! Your Turn! Which atom would you expect to be larger? Krypton or Xenon ?      Kr (36)         Xe (54) Calcium or Gallium ?       Ca (20)         Ga (31) Antimony or Indium ? Sb (51)    In (49)
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UA GenChem Trends: Continued Trends: Continued
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UA GenChem Electrons in Atoms Electrons in Atoms Electrons in an atom can be classified into two main groups: CORE electrons : Strong attraction to protons in the nucleus (closer) Unavailable for exchange or bonds. VALENCE electrons : Weaker attraction (farther) and easier to remove. Exposed to other atoms for interaction Na = [Ne] 3s 1 CORE ELECTRONS VALENCE ELECTRONS
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UA GenChem C arbo n C arbo n C arbo n C arbo n G ro up 4A       G ro up 4A       Z = 6 Z = 6         1s 1s 2 2     2s 2s 2p 2p 2 2             6 electrons 6 electrons We can also write [He] 2s 2 2p 2 Core Electrons Valence Electrons See a correlation between  group #  and valence electrons?
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UA GenChem 1 2 3 4 5 6 7 6 7 Periodic Table: Useful Guide Periodic Table: Useful Guide What is the Electronic Configuration Of Ge ( element 32)? Ge = [Ar] 4s 2 3d 10 4p 2 Ge
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UA GenChem Summary Activity: Let’s use the following data to help us identify an element *It is the 2 nd smallest atom in its row on the periodic table *Under most conditions, two atoms of this element will combine together to form a diatomic molecule *It forms a -1 ion *Its valence electrons include 2 electrons in an s subshell and 5 electrons in a p subshell
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