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Ionic and Covalent Bonds
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Two or more elements chemically combined. Compound
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called an ionic compound because it is made up of negative and positive ions that have resulted from the transfer of electrons from a metal to a non-metal. Ionic Compounds
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Ions in ionic compounds are held together by the electrostatic force between oppositely charged bodies. In other words, positive and negative ions attract. Ionic Compounds
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For example: Sodium (Na) wants to lose ____ electron). Chlorine (Cl) wants to gain ____ electron). Ionic Compounds
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Calcium needs to lose ____ electrons, and fluorine needs to gain ____ Calcium Fluoride
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What happens? Calcium Fluoride
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What happens? Calcium Fluoride
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In the chemical formula the symbols of elements are written with a subscript which indicates how many of that element are present in the compound only numbers above one are written Chemical Formulas and Composition of Compounds
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Formula for sodium chloride = Formula for calcium fluoride = Chemical Formulas and Composition of Compounds NaCl CaF 2
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Ionic compounds are called electrolytes. Electrolytes are substances that when dissolved in water, conduct electricity. Electrolytes
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form when non-metals combine with non-metals non-electrolytes because they form solutions that do NOT conduct electricity. Covalent/Molecular Compounds
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Valence electrons are shared between atoms to fill the outer shell Covalent/Molecular Compounds
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pg. 191 #1, 2 (Lewis diagram instead), 3, 4, 6, 7 pg. 195 #1, 2, 6, 7, 9 Homework
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