Reference no: EM13132738
The Shapes of Molecules and Ions from the VSEPR Theory
The VSEPR Theory: it is the arrangement of atoms in molecules and ions
This theory is applied in the following way:
Consider molecules (or ions) in which the central atom is covalently bonded to two or more atoms or groups
Consider all the valence electron pairs of the central atom-both those that are shared in covalent bonds, called bonding pairs, and those that are unshared, called non-bonding pairs or unshared pairs.
Because electron pairs repel each other, the electron pair of the valence shell tend to stay far apart as possible. The repulsion between non-bonding pairs is generally greater than that between bonding pairs.
The geometry of the molecule is arrived at by considering all of the electron pairs, bonding and non-bonding, but the shape of the molecule or ion is described by referring to the positions of the nuclei (or atoms) and not by the position of the electron pairs.
Problems:
Use the VSEPR theory to predict the geometry of each of the following molecules and ions: a)BH4- b)BeF2 c) NH+ 4 d) H2S e)BH3 f) CF4
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