CHEM 110 Chapter Notes - Chapter 10: Atomic Orbital, Chemical Polarity, Electronegativity
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CHEM 110 Full Course Notes
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10. 1: lewis theory: an overview: lewis theory. Electrons, especially valence electrons, play a fundamental role in chemical bonding. Ionic bonding occurs when electrons are transferred from one atom to another (between positive and negative ions). Covalent bonding occur when electrons are shared between atoms. Electrons are transferred or shared in such a way that each atom acquired an especially stable electron configuration (octet). Definition: a lewis symbol consists of a chemical symbol to represent the nucleus and core (inner-shell) electrons of an atom, together with dots placed around the symbol to represent the valence electrons. Definition: a lewis structure is a combination of lewis symbols that represents either the transfer or the sharing of electrons in a chemical bond. Lewis structures for ionic compounds: for an ionic compound of a main-group element. The lewis symbol of the metal ion has no dots if all the valence electrons are lost.