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Total number of elements which are present in a row on the periodic table between those elements, whose wavelength of K α lines are equal to 250 and 179 pm are (Rydberg constant = 1 . 097 × 10 7 m - 1 )

Correct answer

3

Step-by-step solution

Wavelength of K α line is given by λ = 4 3 R Z - 1 2 For λ , between 250 and 179 pm three elements are possible ( Z = 24 , 25 and 26 ).

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