4_Chapt7 - Mary J Bojan Chem 110 1 Periodicity Properties...

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Unformatted text preview: Mary J. Bojan Chem 110 1 Periodicity Properties of elements • Sizes of atoms and ions Electron Configuration of ions • Ionization Energy • Electron affinity • Reactivity • Metallic Character Mary J. Bojan Chem 110 2 Electron Configuration and the Periodic Table Ø halogens ( F, Cl, Br, I ) have Ø noble gases ( inert ) have Valence electrons determine the chemistry! Location on Periodic Table is related to electron configuration Elements in the same row (family) have the same valence shell configuration. Example: alkali metals (row 1) have ns 1 valence configuration (H) 1s 1 Li [He] 2s 1 Na [Ne] 3s 1 K [Ar] 4s 1 Rb [Kr] 5s 1 Cs [Xe] 6s 1 Mary J. Bojan Chem 110 3 PROPERTIES OF ELEMENTS Properties of elements are determined by: • Size (n) and shape ( ) of orbitals • Atomic number (nuclear charge) Electron Configurations = structure of the atom Electron configurations determine • the organization of the Periodic Table AND • the properties of the elements: reason for periodic trends in behavior Elemental properties: atomic size ionization energy electron affinities reactivity Mary J. Bojan Chem 110 4 ATOMIC SIZE size decreases going from left to right across a period WHY ?...
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

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4_Chapt7 - Mary J Bojan Chem 110 1 Periodicity Properties...

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