Resonance Applications In Physical Science by Michael Mark Woolfson

Author:Michael Mark Woolfson
Language: eng
Format: epub
Publisher: Imperial College Press

Figure 6.1 The structure of sodium chloride. Large circle = sodium, small circle = chlorine.

The lesson drawn from these examples is that in most cases, when molecules form, subshells are filled and, since subshells always contain even numbers of electrons, there will always be a pairing of spin-up and spin-down electrons. Hence, for the most part, molecules have no net electron-spin angular momentum and are not amenable to examination by the technique of electron spin resonance (ESR) spectroscopy, which is analogous to the use of NMR technique described in Chapter 5. An exception would be for a class of molecules containing elements such as scandium, described in Section 6.1.1, where, although it may fill up an outer subshell in forming a molecule, still has an unpaired electron in an inner shell.

Exercise 6.2 Draw a diagram, similar to Figure 6.2, to represent the electronic structure of ammonia, NH3.

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