Electron Dots For Cations l Metals will have few valence electrons l These will come off l Forming positive ions Ca +2.Electron Dots For Cations l Metals will have few valence electrons l These will come off Ca.Electron Dots For Cations l Metals will have few valence electrons Ca.l Na 1s 2 2s 2 2p 6 3s 1 - 1 valence electron l Na + 1s 2 2s 2 2p 6 -noble gas configuration Electron Configurations for Cations l Metals lose electrons to attain noble gas configuration.Write the electron dot diagram for l Na l Mg lClC lOlO lFlF l Ne l He.N l Then add 1 electron at a time to each side. The Electron Dot diagram for Nitrogen l Nitrogen has 5 valence electrons.l Put one dot for each valence electron l Dont pair up until they have to X Electron Dot diagrams l A way of keeping track of valence electrons.l Group 2A - Be, Mg, Ca, etc.- l 2 valence electrons l Easily found by looking up the group number on the periodic table. Keeping Track of Electrons l Atoms in the same column have the same outer electron configuration.l Core electrons -those in the energy levels below.
l Valence electrons - The s and p electrons in the outer energy level. Keeping Track of Electrons l The electrons responsible for the chemical properties of atoms are those in the outer energy level.Remember l Only electrons can move l Atoms gain or lose electrons to achieve a noble gas configuration l To be stable.Atoms and Ions l Chemical Bond force that holds 2 atoms together l Atoms are neutral=same number of protons as electrons l Ionatom that has lost or gained electrons (it has a charge of + or -).Ionic Bonding Writing Formulae Naming Compounds.
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