Lec-07-Chap-03-2 - CHE 131 Lecture 7, 2/6/2006 Ionic...

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CHE 131 Lecture 7, 2/6/2006 Ionic Compounds and Compositions Lecture seven (Chapter three) Benjamin S. Hsiao Department of Chemistry Stony Brook University Ionic Compounds Characteristics of compounds with ionic bonding: • non-volatile, thus high melting points • solids do not conduct electricity, but melts (liquid state) do • many, but not all, are water soluble Formation of Ionic Compound, NaCl Valance, Charge on Ions • compounds have electrical neutrality • metals form positive monatomic ions • non-metals form negative monatomic ions
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CHE 131 Lecture 7, 2/6/2006 Valence of Metal Ions Monatomic Ions Group IA +1 Group IIA +2 Maximum positive valence equals Group A # Valence of Non-Metal Ions Monatomic Ions Group VIA -2 Group VIIA -1 Maximum negative valence equals (8 – Group A #) Charges on Some Common Monatomic Cations and Anions Compounds that have elements that vary in charge: SnCl 2 versus SnCl 4 CuO copper(II) oxide Cu 2 O copper(I) oxide
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CHE 131 Lecture 7, 2/6/2006 Polyatomic Ions
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Lec-07-Chap-03-2 - CHE 131 Lecture 7, 2/6/2006 Ionic...

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