Lec4 - Lec-4_5: Periodic table and Compounds Roy A. Lacey,...

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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 1 Lec-4_5: Periodic table and Compounds
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 2 Tabular display of chemical elements which provides a useful framework to classify, systematize, and compare the chemical and physical properties of elements. Periodic table Mendeleev’s Periodic Table ¾ He left open spaces in his periodic table to account for elements not yet discovered
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 3 Modern periodic table Elements ordered in terms of increasing atomic number Period Group Transition elements ordering reflects electronic configuration
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 4 Chemical Reactivity 1 2 3 4 5 6 7 ` Families Similar valence e - within a group result in similar chemical properties
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 5 Modern periodic table 1 2 3 4 5 6 7 ` Alkali Metals ` Alkaline Earth Metals ` Transition Metals ` Halogens ` Noble Gases
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 6 Periodic table The modern periodic table is based on a classification of elements in terms of their physical and chemical properties. ¾ The horizontal rows are called periods. ¾ Columns contain elements of the same family or group. ¾ The main group elements or representative elements are in groups 1 & 2 (alkaline and alkaline earth metals) and 13 – 18. 9 Group 17 contains the halogens. ¾ Transition metals are the elements in groups 3 - 12. ¾ The noble gasses are the elements in group 18
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 7 Information in the Periodic table Each row (period) in the table corresponded to the filling of a quantum shell of electrons (will be discussed later).
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 8 Periodic table Alternative periodic tables have been developed to highlight or emphasize different chemical or physical properties of the elements which are not as apparent in traditional periodic tables Benfey's periodic table Depicts the elements as a seamless series with the main group elements radiating from the center with the d- and f-elements filling around loops
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 9 Timmothy Stowe's “physicists periodic table”. This table depicts periodicity in terms of quantum numbers Periodic table
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Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 10 Compounds Different kinds of [simple] compounds can be formed Metal + Metal Metal Compound Metal + Non-Metal Ionic Compound Non-Metal + Non-Metal Covalent Compound Metals: 9 High conductivity 9 High melting point 9 Hard 9 malleable
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Roy A. Lacey, Stony Brook University;
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Lec4 - Lec-4_5: Periodic table and Compounds Roy A. Lacey,...

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