01:160:161 Lecture 5: Chapter 5 Atoms First
9 Apr 2016
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Document Summary
Chemical bonds are strong attractive forces that exist between atoms in a molecule. The valence electrons form a band of electronic cloud surrounding the nucleus. Results from the attraction between positive (cation) and negative (anion) ions. Formed between elements that vary greatly in electronegativities. Results from sharing an electron pair between two atoms. Covalent compounds are molecular solids, liquids, or gases . H2o (s), h2o (l), h2o (g) o2 (g) Theory for chemical bonding-an overview: valence electrons play a fundamental role in bonding. Transfer of electron(s) from one atom to another generates a cation and an anion that attract each other, resulting in ionic bonding. Sharing an electron pair between atoms result in covalent bonding. In gaining ,losing or sharing electrons, atoms acquire noble gas configuration. These are e -dot symbols where the valence electrons are represented by dots. Lewis symbols do not specifically reflect electron pairing as is done above for be.
