1. Topic: Trends in the Periodic Table: Ionization Energy and Electronegativity

2. REVIEW: How do you know if an atom gains or loses electrons? Metals tend to lose electronsMetals tend to lose electrons Nonmetals tend to gain electronsNonmetals tend to gain electrons

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4. Ionization Energy the amount energy required to remove a valence electron from an atom in gas phasethe amount energy required to remove a valence electron from an atom in gas phase

5. Cs valence electron lot farther away from nucleus than LiCs valence electron lot farther away from nucleus than Li attraction much weaker so easier to steal electron away from Csattraction much weaker so easier to steal electron away from Cs THEREFORE, Li has a higher Ionization energy then CsTHEREFORE, Li has a higher Ionization energy then Cs previousprevious | index | nextindexnext

6. Decreased Ionization Energy (easier to remove an electron) Increased Ionization Energy (harder to remove an electron)

7. Electronegativity ability of atom to attract electrons in bondability of atom to attract electrons in bond noble gases tend not to form bonds, so don’t have electronegativity valuesnoble gases tend not to form bonds, so don’t have electronegativity values Unit = PaulingUnit = Pauling Fluorine: most electronegative elementFluorine: most electronegative element = 4.0 Paulings = 4.0 Paulings

8. Decreased Ionization Energy (easier to remove an electron) Increased Ionization Energy (harder to remove an electron) Decreased Electronegativity Increased Electronegativity

10. Reactivity of Metals judge reactivity of metals by how easily electronsjudge reactivity of metals by how easily give up electrons (they’re losers) So the easier it is to remove an electron the more reactive –Lower ionization energy = more reactive = more metallic

11. Decreased Ionization Energy (easier to remove an electron) Increased Ionization Energy (harder to remove an electron) Decreased Electronegativity Increased Electronegativity Most reactive metal = Fr (the most metallic) More metallic

12. Reactivity of Non-metals judge reactivity of non-metals by how easily electrons (they are winners)judge reactivity of non-metals by how easily gain electrons (they are winners) So the greater the affinity for electrons, the more reactive –Higher electronegativity= more reactive

13. Decreased Ionization Energy (easier to remove an electron) Increased Ionization Energy (harder to remove an electron) Decreased Electronegativity Increased Electronegativity Most reactive metal = Fr (the most metallic) More metallic Most Reactive Nonmetal = F Nonreactive BACK NonreactiveNonreactive