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Unformatted text preview: udo­Noble Gas Core 6 1s2 2s2 2p 3s2 3p 3d 6 6 10 1s 2s 2p 10 [Ar] 3d [Ne] Conclusion: In Lewis Electron – Dot Symbo ls: Ø dots represent valence electrons Ø symbols of elements represent Noble Gas Cores or Pseudo – Noble Gas Cores 2 Chemistry 101 Chapter 9 LEWIS ­ ELECTRON DOT SYMBOLS FOR REPRESENTATIVE ELEMENTS IA IIA IIIA IVA VA VIA VIIA VIIIA Li Be B C N O F Ne 1 2 2 1 2 2 2 3 2 4 2 5 2 [He]2s [He]2s [He]2s 2p [He]2s 2p [He]2s 2p [He]2s 2p [He]2s 2p [He]2s 2p6 2 Li Be B C N O F Ne Na Mg Al Si P S Cl Ar 1 2 2 1 2 2 2 3 2 4 2 5 2 [Ne]3s [Ne]3s [Ne]3s 3p [Ne]3s 3p [Ne]3s 3p [Ne] 3s 3p [Ne] 3s 3p [Ne]3s 3p6 3 Na Mg 1 ns 2 ns X X Al 2 ns np1 X Si P S Cl Ar 2 ns np2 2 ns np3 2 ns np4 2 ns np5 2 ns np6 X X X X X Number of Dots = Number of Valence Electrons = Group Number 3 Chemistry 101 Chapter 9 IONIC BOND · Ionic bonds are commo nly found in “SALTS” · Recall SALTS are made up of : CATIONS any posit ive ion + other than H and · Examples of Salts: (NH4)2SO4 NaCl KNO3 ANIONS any negat ive ion other than OHNH4C2H3O2 Properties of Salts: Ø crystalline so lids at room temperature (RT) Ø have high Melt ing Points Ø are Strong Electrolytes in mo lten form and in aqueous solut ion FORMATION...
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This document was uploaded on 03/18/2014 for the course CHEM 101 at Los Angeles Mission College.

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