Bonding+2011.ppt - Ionic and Covalent Bonds Notes Valence Electrons are The electrons in the outer energy level responsible for the chemical properties

Bonding+2011.ppt - Ionic and Covalent Bonds Notes Valence...

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Ionic and Covalent Bonds Notes
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Valence Electrons are…? The electrons in the outer energy level responsible for the chemical properties of atoms.
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To find Valance electrons The number of valence electrons are easily determined. It is the group number for elements in group 1A to 8A Li group 1A has 1 valance electron N group 5 A has 5 valance electrons Exception He only has 2 valance electrons
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Formation of Cations Metals lose electrons to attain a noble gas configuration. They make positive ions (cations) Formation of Anions Nonmetals gain electrons to attain noble gas configuration. They make negative ions (anions)
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Polyatomic ions Group of atoms that act as a single unit that have a charge Example: ammonium NH 4 +1 Carbonate CO 3 -2
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Electron Dots Structures Also called Lewis dot diagrams Show the valance electrons as dots Rule: 1 dot per side until each side has a least one, then they pair up. Li B C N O Be F Ne 1A 2A 3A 4A 5A 6A 7A 8A Group numbers
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Octet Rule When forming compounds atoms want a stable electron configuration like a noble gas. this means 8 electrons in the outer most shell.
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