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Magazine Problem 11
Why is the shape of a molecule determined by repulsions between electron pairs and not by repulsions between nuclei?
Problem 14
Why do \(\mathrm{CF}_{4}, \mathrm{SF}_{4},\) and \(\mathrm{XeF}_{4}\) have different molecular geometries, even though they all consist of a central atom bonded to four fluorine atoms?
Problem 15
Why are the bond angles in \(\mathrm{BH}_{3}\) and \(\mathrm{NH}_{3}\) different, even though they both consist of a central atom bonded to three hydrogen atoms?
Problem 16
The O-N-O bond angle in \(\mathrm{NO}_{2}^{+}\) is larger than it is in \(\mathrm{NO}_{2} .\) Why?
Problem 17
Why are the \(\mathrm{H}-\mathrm{C}-\mathrm{H}\) bond angles in molecules of \(\mathrm{CH}_{4}\) smaller than the \(\mathrm{H}-\mathrm{C}-\mathrm{H}\) bond angles in molecules of \(\mathrm{CH}_{2} \mathrm{O} ?\)
Problem 18
Why do we need to draw the Lewis structure of a molecule before predicting its geometry?
Problem 22
Rank the following molecular geometries in order of increasing bond angles: (a) trigonal pyramidal; (b) trigonal planar; (c) square planar.
Problem 24
How many lone pairs of electrons would there have to be on a \(\mathrm{SN}=6\) central atom for it to have a linear molecular geometry?
Problem 25
Determine the molecular geometries of the following molecules: (a) GeH \(_{4} ;\) (b) \(\mathrm{PH}_{3} ;\) (c) \(\mathrm{H}_{2} \mathrm{S} ;\) (d) \(\mathrm{CHCl}_{3}.\)
Problem 38
The first compound containing a xenon-sulfur bond was isolated in \(1998 .\) Draw a Lewis structure for HXeSH and determine its molecular geometry.
