Chapter 7 - Chapter 7 Periodic Properties of the Elements...

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Chapter 7 Periodic Properties of the Elements General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Periodic Properties of Elements Metals, non-metals, metalloids (semiconductors) Metallic vs. non-metallic character more non-metallic character in periodic table Na, Mg, Al (metals) Si (metalloid) P, S, Cl (non-metals) C (non-metal) Si (metalloid) Ge (metal) Sn (metal) Pb (metal) more metallic character in periodic table General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Ionization Energy Metallic vs. Non-metallic Character of Elements Ionization Energy – energy required to remove one electron from an atom (first ionization energy). Compare ionization energy for Li, Be, and Na. Li Li + + e energy needed to remove this electron, Δ E 1 , called E ionization Δ E 1 = 520 kJ/mol (endothermic process) Li + Li +2 + e energy needed to remove this second electron, Δ E 2 , called second E ionization Δ E 2 >> Δ E 1 it is much easier to remove valence electrons that lower level electrons General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Ionization Energy Metallic vs. Non-metallic Character of Elements Compare ionization energy for Li, Be, and Na. Li Li + + e Δ E 1 = 520 kJ/mol Na Na + + e Δ E 1 = 496 kJ/mol it is easier to remove electrons from 3s 1 orbital than from 2s 1 orbital; there is no significant difference. Δ E 1 (Na) E 1 (Li) Δ E 1 ( E ionization ) increases Δ E 1 (Li) E 1 (Na) E 1 (K) E 1 (Rb) lower E ionization , easier to ionize, more metallic character General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Ionization Energy Metallic vs. Non-metallic Character of Elements Compare ionization energy for Li, Be, and Na. Li Li + + e Δ E 1 = 520 kJ/mol Be Be + + e Δ E 1 = 899 kJ/mol Why? Li(+3)
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This note was uploaded on 05/04/2009 for the course CHEM 0207 taught by Professor Cizkowska during the Spring '09 term at CUNY Brooklyn.

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Chapter 7 - Chapter 7 Periodic Properties of the Elements...

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