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Unformatted text preview: 1 1 Lecture 5 square4 Last time: square4 Structure of the atom square4 Today: square4 Description and Representation of an atom of an element (from last notes) square4 Atoms, molecules and ions square4 Writing chemical formula 1 Other Atomic Species square4 Ions-obtained when electrons are added to, or removed from a neutral species square4 Cation-a positively charged ion-the result of removing 1 or more electrons from a neutral species square4 Anion-a negatively charged ion-the result of a neutral species gaining one or more electron 2 Ions Simple ions: square4 charged species containing only one atom: eg: Na + , O 2- Polyatomic ions: square4 charged species containing a group of atoms held together by strong bonds: NO 2- , SO 4 2- see Table 8.4 Chapter 8 page 314 for a list 3 Structural Units of Pure Substances square4 the smallest units: atoms ions (neutral) (charged species) 4 Add or remove electrons These small units combine in various ways to produce pure substances 2 2 Structural Units of Pure Substances...
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