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Grade 11Physical Chemistry

Wave number of series limit of PASCHEN series is Rh. This possible for...
(1) H
(2) He+
(3) Li2+
(4) All of these

Profile image of Rupam Tirkey
7 Years agoGrade 11
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1 Answer

Profile image of jyoti bhatia
7 Years ago
 
This is possible for H. 
In 1885, Balmer came up with a simple formula for predicting the wavelength of any of the lines in atomic hydrogen in what we now know as the Balmer series. Three years later, Rydberg generalized this so that it was possible to determine the wavelengths of any of the lines in the hydrogen emission spectrum. Rydberg suggested that all atomic spectra formed families with this pattern. It turns out that there are families of spectra following Rydberg's pattern, notably in the alkali metals, sodium, potassium, etc., but not with the precision the hydrogen atom lines fit the Balmer formula.