Chemistry Assignment Help with Mosley Experiment
3.4 Mosley Experiment

Moseley a brilliant student of Rutherford, in 1913 made the first detailed study of the characteristic x-ray spectrum emitted by different elements and showed that the square root of the frequency () of a spectral line is directly related with the nuclear charge (Z), if the excitation potential is fixed.
When a graph was plotted between × 10–8 and the atomic number (Z), a straight line was obtained.
The results obtained led to the suggestion that () must be directly proportional to the atomic number of an element.
µ Z
To give accurate results, Mosley modified this equation as
µ (Z – b)
where b is a constant and is known as screening constant. For Ka and Kb lines, b = 1.
Hence, = a(Z – 1).....(1)
where a is proportionality constant.

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