The Representative Elements Groups 1A Through

We have combined two chapters "The Representative Elements Groups 1A through 4A" and "The Representative Elements Groups 5A through 8A," into one chapter to provide a more focused and usable treatment of descriptive chemistry. 

Chapter Nineteen The Representative Elements Groups 1A Through 4A... 

Making a Model Construct a periodic table and label the representative elements by group (1A through 7A). Using the information in your data table and the periodic table, record the identities of elements observed during the lab in your periodic table. 

The traditional form of the periodic table is shown in Fig. 18.1. Recall that the representative elements, whose chemical properties are determined by the valence-level s and p electrons, are designated Groups 1A through 8A. The transition metals, in the center of the table, result from the filling of d orbitals. The elements that correspond to the filling of the 4/ and 5f orbitals are listed separately as the lanthanides and actinides, respectively. 

The representative elements in groups 1A through 8A have only s and p electrons. 

Reduction reaction. The half-reaction that involves the gain of electrons. (4.4) Representative elements. Elements in Groups 1A through 7A, aU of which have incompletely filled s or p subsheU of highest principal quantum uumber. (8.2) Resonance. The use of two or more Lewis shuctures to represeut a particular molecule. (9.8)... 

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