CHEM 1000 Chapter Notes - Chapter 10-12: Trigonal Bipyramidal Molecular Geometry, Trigonal Planar Molecular Geometry, Coordinate Covalent Bond

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Electrons, particularly valence electrons play a fundamental role in chemical bonding. When elements combine to produce compounds they are attempting to achieve a full valence shell. Electrons can be transferred from one atom to another to make ions. The atoms are then held together by coulombic forces in an ionic bond. More often the only way an atom can gain electrons is by sharing. Lewis symbols: consists of a chemical symbol to represent the nucleus and core electrons of an atom, together with dots placed around the symbol to represent the valence electrons. Lewis structure: combination of lewis symbols that represents either the transfer or the sharing of electrons in a chemical bond. Ionic compounds are crystals where an anion is attached to several cations and vice versa. Electrical neutrality means the total number of each ion is the same. The energy cost of making the ions is too high. Could be more than just a couple of shared electrons.

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