Ionic and Covalent Bonds. Two or more elements chemically combined. Compound.
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Transcript of Ionic and Covalent Bonds. Two or more elements chemically combined. Compound.
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Ionic and Covalent Bonds
How Elements Form Compounds
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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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Ionic Compounds
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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
CaF2
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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