cm13 - Chapter 7 Ionic Bonding Keeping Track of Electrons...

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Unformatted text preview: Chapter 7 Ionic Bonding Keeping Track of Electrons The electrons responsible for the chemical properties of atoms are those in the outer energy level. Valence electrons- The s and p electrons in the outer energy level. Core electrons-those in the energy levels below. Basis for shorthand Keeping Track of Electrons Atoms in the same column Have the same properties because Have the same outer electron configuration. Have the same valence electrons. Found by looking up the group number on the periodic table. Group 2A - Be, Mg, Ca, etc.- 2 valence electrons Electron Dot diagrams A way of keeping track of valence electrons. How to write them Write the symbol. Put one dot for each valence electron Don’t pair up until they have to X The Electron Dot diagram for Nitrogen Nitrogen has 5 valence electrons. First we write the symbol. N Then add 1 electron at a time to each side. Until they are forced to pair up. Write the electron dot diagram for Na Mg C O F Ne He Electron Configurations for Cations Metals lose electrons to attain noble gas configuration. They make positive ions. Na 1s 2 2s 2 2p 6 3s 1- 1 valence electron Na + 1s 2 2s 2 2p 6 -noble gas configuration Electron Dots For Cations Metals will have few valence electrons Ca Electron Dots For Cations Metals will have few valence electrons These will come off Ca Electron Dots For Cations Metals will have few valence electrons These will come off Forming positive ions Ca 2+ Electron Configurations for...
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cm13 - Chapter 7 Ionic Bonding Keeping Track of Electrons...

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