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General Chemistry Principles, Patterns, and Applications, 2011

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Using Lewis Electron Structures to Explain Stoichiometry<br />

Lewis dot symbols provide a simple rationalization of why elements form compounds with the observed<br />

stoichiometries. In the Lewis model, the number of bonds formed by an element in a neutral compound is the same as<br />

the number of unpaired electrons it must share with other atoms to complete its octet of electrons. For the elements<br />

of group 17 (the halogens), this number is one; for the elements of group 16 (the chalcogens), it is two; for group 15,<br />

three; <strong>and</strong> for group 14, four. These requirements are illustrated by the following Lewis structures for the hydrides of<br />

the lightest members of each group:<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

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