15 PeriodicityLandscape - 1 CH112 LRSVDS PERIODICITY...

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Unformatted text preview: 1 CH112 LRSVDS PERIODICITY Periodicity Sizes of atoms and ions Ionization Energy Electron affinity Electronegativity Metallic Character Diagonal Relationships Multiple Bonding 2 CH112 LRSVDS PERIODICITY Sizes of Atoms 2 Periodicity Atomic radii increase with increasing electron shielding . Atomic radii decrease with increasing effective nuclear charge . 3 CH112 LRSVDS PERIODICITY Ion Size Cations have _________ radii than their neutral atoms. Anions have _________ radii than their neutral atoms. 4 CH112 LRSVDS PERIODICITY Sizes of atoms and ions Even though cations have smaller radii and anions have larger radii than neutral atoms, the periodic trends in size are still valid for both atoms and ions. 5 CH112 LRSVDS PERIODICITY IONIZATION ENERGY ! Moving down a group, IE ______________ because of increased electron shielding . ! Moving across a row from left to right, IE ________ because of increased effective nuclear charge . What are the trends? Definition of Ionization energy (IE): Na( g ) ! Na + ( g) + e- Ionization energy always _____________ Energy (endo or exo?) 6 CH112 LRSVDS PERIODICITY Ionization energy Is it easier to remove an electron if it is un-paired or paired? Is it easier to remove an electron from a 2p orbital or one from a filled 2s orbital? 7 CH112 LRSVDS PERIODICITY ELECTRON AFFINITY Electron affinity : opposite of _____________ Electron affinity is the energy change when a gaseous atom _________ an electron to form a gaseous ion:...
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This note was uploaded on 12/20/2011 for the course CHEM 112 taught by Professor Vandersluys,lorschmid,kylem during the Fall '07 term at Pennsylvania State University, University Park.

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15 PeriodicityLandscape - 1 CH112 LRSVDS PERIODICITY...

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