CHM1011 Study Guide - Quiz Guide: Trigonal Planar Molecular Geometry, Trigonal Pyramidal Molecular Geometry, Molecular Geometry
7 Aug 2018
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Bonds between elements of very different electronegativity. Held in 3d arrangements by attractive forces between oppositely charged ions. Most stable arrangement of atoms occurs when potential energy is at a minimum i. e. - shared electron density between two nuclei is a covalent bond. The separation distance at which molecule has maximum energetic advantage. Nuclei within molecules move continuously, oscillating around lowest energy separation distance. Energy difference between molecule and separated atoms. Determine total number of valence electrons present. Arrange atoms- group around central atom which is often the least electronegative and join with single bonds. Add enough electrons starting with terminal atoms to give an octet. Place remaining electrons on the central atom. Depends on difference between valence electrons in the free atom compared to in the molecule. Su(cid:373) of the fo(cid:396)(cid:373)al (cid:272)ha(cid:396)ges o(cid:374) the (cid:373)ole(cid:272)ule (cid:373)ust e(cid:395)ual the (cid:373)ole(cid:272)ule"s ove(cid:396)all (cid:272)ha(cid:396)ge. Does not represent the true charge of the atom.
