Radial parts of wavefunction

From Table 1.2, we see that the radial parts of the wave-functions decay exponentially as r increases, but the decay is slower for n = 2 than for n = 1. This means that the likelihood of the electron being further from the nucleus increases as n increases. This pattern continues for higher values of n. The exponential decay can be seen clearly in Figure 1.5a. Several points should be noted from the plots of the radial parts of wavefunctions in Figures 1.5 and 1.6 ... 

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