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Lect_W6 - General Chemistry CHEM 151 Week 6 UA GenChem What...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 6
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UA GenChem What trends do you see? Implications? What trends do you see? Implications? H H He Li
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UA GenChem Shell Model of the Atom Shell Model of the Atom The trends in the first ionization energy suggest that electrons are arranged in energy shells. n= 1 n= 2 Shell # of e- n = 1 2 e- n = 2 8 e- n = 3 8 e- n = 4 18 e- Observations
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UA GenChem First ionization energies of the main- group elements
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UA GenChem Summary Activity: What ion does a sodium atom form and why?
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UA GenChem Photoelectron Spectroscopy Another spectroscopic technique can be used to determine number of electrons with a determined energy in an atom. KE h ν Ionization Energy = h ν - KE The n th Ionization Energy is the energy needed to remove the n th electron from an atom.
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UA GenChem Experimental Evidence of Electron Configurations
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UA GenChem First ionization energy removes electron from outermost shell. PES measures the energy to remove one electron from any shell of a neutral atom. Energy of entering photon (h ν ) is larger than ionization energy (Ie), so the electron leaves the atom with excess kinetic energy (KE), which PES measures. h ν = Ie + KE known (scanned) measured determined h ν n = KE Ie Photoelecton Spectroscopy (PES)
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UA GenChem 1.31 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) H
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UA GenChem 2.37 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) He
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UA GenChem 6.26 0.52 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) Li
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UA GenChem 11.5 0.90 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) Be
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UA GenChem 19.3 1.36 0.80 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) B
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UA GenChem 28.6 1.72 1.09 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) C
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UA GenChem 39.6 2.45 1.40 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) N
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UA GenChem 52.6 3.12 1.31 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) O
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UA GenChem 67.2 3.88 1.68 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) F
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UA GenChem 84.0 4.68 2.08 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) Ne
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UA GenChem 104 6.84 3.67 0.50 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) Na
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UA GenChem 151 12.1 7.79 1.09 0.58 0 2 4 6 8 10 12 14 16 Number of Electrons Energy (MJ/mol) Al .      Mg
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