CHAPTER 9_periodic prop_Fall 2006

CHAPTER 9_periodic prop_Fall 2006 - CHAPTER 9: CLASSIFYING...

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CHAPTER 9: CLASSIFYING THE ELEMENTS (and a little bit of CH 10) “When the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically.” -Dmitri Mendeleev // Lothar Meyer later Henry Mosely …”arranged according to increasing atomic  number…” BUT --- originally organized based on chemical and physical  properties Group 1A: alkali metals Group 2A: alkaline earths The Bs: transition series Group 3A: boron family Group 4A: carbon family Group 5A: nitrogen family
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Group 6A: chalcogens Group 7A: halogens Group 8A: noble gases Hydrogen? Geography of the Periodic Chart:   families periods representative elements metals  non-metals metalloids (semi-metals) transition elements lanthanides actinides Atomic Properties and Periodic Trends Only two ways: down families and across rows ATOMIC RADII … IONIC RADII Covalent radius … metallic radius … ionic radius where does one atom / ion stop and the other begin?
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CHAPTER 9_periodic prop_Fall 2006 - CHAPTER 9: CLASSIFYING...

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