Angstrom quantum number

Table 1 Parameters for homonuclear and heteronuclear bonding of elements in the same (intra-row) and subsequent (interrow) rows of the periodic table (n = principal quantum number r in angstrom k in millidyne per angstrom standard deviations in parentheses)...

In Chapters 1 through 4, we focused on a desaiption of matter at the molecular and atomic levels. In such a description, the state of the system is described quantum mechanically in terms of the wave function, which is a function of the positions of all the particles. However, without highly specialized equipment, the observable world is far removed from the molecular realm both in terms of the number of atoms or molecules ( 10 instead of just a few) and length scale (centimeters and meters instead of Angstroms and nanometers). Objects that are very large compared to the molecular scale are referred to as macroscopic It is both inconvenient and impossible to describe a macroscopic system in terms of the detailed atomic-scale variables of the constituent molecules—there are simply too many. Instead we characterize the state of macroscopic systems using a relatively small set of quantities, called macroscopic properties (or thermodynamic properties). Two important examples of such properties are pressure and temperature. 

---