Electron Configurations

Electron Configurations - Electron Filling Order: Follow...

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Unformatted text preview: Electron Filling Order: Follow the Periodic Table! Electron Configurations and the Periodic Table 1 General Periodic Trends •  Atomic and ionic size •  Ionization energy •  Electron affinity Higher effective nuclear charge Electrons held more tightly Larger orbitals. Electrons held less tightly. Atomic Radii: Sizes of main group atoms 2 Sizes of Transition Elements Ion Sizes Does the size go up or down when losing an electron to form a cation? 3 Ion Sizes + Li,152 pm 3e and 3p Li +, 78 pm 2e and 3 p Forming a cation. •  CATIONS are SMALLER than the atoms from which they come. •  Cation has the same # protons, fewer electrons than neutral atom: electrons held more tightly by nucleus Ion Sizes Does the size go up or down when gaining an electron to form an anion? 4 Ion Sizes F, 71 pm 9e and 9p F - , 133 pm 10 e and 9 p Forming an anion. •  ANIONS are LARGER than the atoms from which they come. •  Anion has the same # protons, more electrons than neutral atom: electrons held less tightly by nucleus. •  Trends in ion sizes are the same as atom sizes for isoelectronic species. Trends in Ion Sizes Dashed circles represent atom size for comparison. 5 ...
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This note was uploaded on 02/16/2011 for the course CHEM 101 taught by Professor Naleway during the Spring '08 term at Loyola Chicago.

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Electron Configurations - Electron Filling Order: Follow...

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