212F11_Chap21 - coordinate covalent bonds, with the metal...

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Ch 21. Nonmetals, Metalloids, Metals, and Metal Complexes Chem 212
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Metals, Non-metals, Metalloids 2 Chem 212
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Some non-metals are found in nature uncombined He and other noble gases O2 N2 P4 S8 3 Chem 212 O O N N
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Carbon is found in a number of allotropes Graphite Diamond C60 4 Chem 212
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Other Non-metals are present as compounds Cl can be found as NaCl § Other halogens, as well Sulfides, oxides, phosphates, carbonates, etc. § Elements which can be found uncombined are also found as compounds Generally need to be OXIDIZED to recover 5 Chem 212
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Metalloids are also found as compounds Silicon – SiO2 § Sand, Quartz Must be REDUCED in order to isolate 6 Chem 212
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Metals are found as compounds Naturally occurring metal compounds called ores Generally oxides or sulfides Isolated by REDUCTION § Chemical § Electrolylsis 7 Chem 212
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In solution, metal ions form complex ions Metal ion is a Lewis acid Surrounded by ligands , which are Lewis bases Ligands form dative bonds, or
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Unformatted text preview: coordinate covalent bonds, with the metal ion • Ligands generally bind to metal ions through electronegative non-metal atoms § Halogens, N, O, P, S 8 Chem 212 Metal complexes have various structures • Structure depends on number of ligands around the metal ion ( coordination number ) § 4 and 6 are the most common 9 Octahedral Chem 212 Bonding in transition metal complexes utilizes d-orbitals 10 • Five d-orbitals • 10 possible d-electrons per shell Chem 212 Metal complexes often are highly colored • Energy differences between d-orbitals allow complexes to absorb visible light • The portion of the spectrum which is NOT absorbed gives rise to the observed color • Color depends on the identity of the metal, oxidation state of the metal, types of ligands, number of ligands, coordination geometry 11 Chem 212 Metal Complexes are important in biology • Hemoglobin • Vitamin B12 12 Chem 212...
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This note was uploaded on 11/27/2011 for the course CHEMISTRY 212 taught by Professor Alliston during the Spring '08 term at Wichita State.

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212F11_Chap21 - coordinate covalent bonds, with the metal...

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