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1 Chapter 5 Ionic Compounds 5.1 Valence Electrons and Electron-Dot Symbols Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings
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2 Valence Electrons Valence electrons are The electrons in the electron configuration that are in the highest energy level Related to the group number
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3 Electron Configurations and Valence Electrons
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4 Electron-Dot Symbols An electron-dot symbol shows the valence electrons around the symbol of the element. Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings
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5 Electron-Dot Symbols The electron-dot symbol for Mg shows two valence electrons as single dots on the sides of the symbol Mg... ·Mg · or Mg · or ·Mg or ·Mg · Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings
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6 Writing Electron-Dot Symbols Electron-dot symbols for: Groups 1A(1) to 4A(14) use single dots. · · Na · · Mg · · Al · · C · · Groups 5A(15) to 8A(18) use pairs and single dots. · · · · · P · : O · · ·
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7 Groups and Electron-Dot Symbols In a group, all the electron-dot symbols have the same number of valence electrons (dots). Example: Group 2A(2) (2 valence electrons) · Be · · Mg · · Ca · · Sr · · Ba ·
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8 Periodic Table and Electron-Dot Symbols Copyright © 2005 by Pearson Education, Inc Publishing as Benjamin Cummings
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9 A. X is the electron-dot symbol for: 1) Na2) K3) Al B. X is the electron-dot symbol for: 1) B2) N3) P Learning Check
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10 A. X is the electron-dot symbol for: 1) Na2) K B. X is the electron-dot symbol for: 2) N3) P Solution
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