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honors - chemical bonding

honors - chemical bonding - CHEMICAL BONDING I Ionic Bonds...

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CHEMICAL BONDING I. Ionic Bonds A. Ionic Bonds form so atoms may have the same electronic configuration as inert gases. 1. Ions form when atoms gain or lose electrons. 2. Positive ions are very strongly attractive to negative ions. 3. Ionic bonds are classified as strong bonds. B. Ionic bonds are formed when a metallic atom transfers an electron to a nonmetallic atom. 1. Ionic compounds are classified as salts. C. Ionic substances form a lattice structure, which are repeating units with strong intermolecular attractive forces. D. Physical Properties of ionic compounds. 1. Ionic compounds are solids at room temperature. 2. Ionic compounds are conductors in the molten (liquid) state, due to free flowing ions. 3. When they are in solid state, they are non-conductors or non-electrolytes. 4. Water soluble ionic compounds are electrolytes in the aqueous state. E. Atomic Size 1. Positively charged ions will have a smaller radius. 2. Negatively charged ions will have a larger radius. F. Electro-negativities 1. Ionic bonds generally have an electronegativity difference that is greater than 1.7. 2. Ionic compounds are electrically neutral. G. Must review all nomenclature rules. H. Writing net ionic equations Precipitation Rxn (reaction) 2NaCl (aq) + Pb(NO 3 ) 2(aq) 2NaNO ⎯⎯→ 3(aq) + PbCl 2 (s) 2Na + (aq) + 2Cl - (aq) + Pb +2 (aq) + 2NO 3 - (aq) ⎯⎯→ 2Na + (aq) + 2NO 3 - (aq) + PbCl 2(s)
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