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Objective: To Introduce ionic bonds and ionic compounds Do Now: Write the electron dot configuration for the following elements: -Sodium -Chlorine -Barium -Krypton
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Ionic compound- compound composed of cations and anions Although they are composed of ions, the ionic compounds are electrically neutral Formation of Ionic Compounds
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Table salt is an ionic compound of sodium cation (Na + ) and a chloride anion (Cl - ) Epsom salt is an ionic compound of magnesium cation (Mg 2+ ) and chloride ions (Cl - ) Ice melt is an ionic compound of calcium cation (Ca 2+ ) and chloride ions (Cl - ) Examples
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1. Most ionic compounds are crystalline solids at room temperature 2. Ionic compounds generally have high melting points 3. Ionic compounds can conduct electric currents when melted or dissolved in water Three Properties of Ionic Bonds
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Ionic bonds are the electrostatic forces that holds ions together in ionic compounds Na + :Cl:Na + + : Cl : - Ionic Bonds....
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Shortcut to predict ionic bonds To predict ionic bonds, you can use the “criss cross” method to determine the ionic bonds Na.:Cl: Sodium will end up with a +1 charge and chlorine will have a -1 charge...
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Na +1 Cl -1 Sr 2+ Br -1
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Lithium and Fluorine Calcium and oxygen Aluminum and Bromine Try these Out
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Naming Ionic Compounds From last lesson (7.1) you know how to name metals and nonmetals when they are ions Metals: keep their element name Nonmetals: end in -ide
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Naming Ionic Bonds NaCl The first element listed in the chemical formula is the one you start with It should not have a change in the name Sodium
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Naming Ionic Bonds The second element listed should be the nonmetal with an –ide at the end Chloride Sodium Chloride (NaCl)
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Try these MgO Al 2 O 3 GaCl 3
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Transition Metals The transition metals MUST have the roman numeral listed with it’s chemical name because of their multiple valences Iron (II) oxide (FeO) Iron (III) nitride (FeN)
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Transition Metals Cu 2 O You know the valence of oxygen and the charge it will have Use that information, and the subscripts to find out the roman numeral for copper
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Transition Metals Cu 2 O Oxygen has 6 valence electrons and will be a 2- charge to reach octet If you need 2 coppers for 1 oxygen, what is the valence electron for this copper?
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Transition Metals Copper has one valence electrons Copper (I) oxide
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Try These Out Titanium (IV) and Chlorine Cobalt (II) and Oxygen Iron (III) and Nitrogen
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Here’s more examples (chemical formula and name) Iron (II) and chlorine Mercury (I) and Nitrogen
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