The radial part of the wave function R_(r) gives the distribution of the electron with respect of its distance r from the nucleus. It depends only on the values of quantum  numbers n and . It is governed principally by the exponential term :
                                               
where           e = base of natural logarithm
                      z = atomic number ; Z = 1 for hydrogen atom
                     a₀ = Bohr radius; = 0.529 A for 1s in hydrogen atom
                     n = radial (principal) quantum number

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