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The number of elements in a row between those elements whose wavelength of $K_{α}$ lines are equal to 250 and 179 pm is (Rydberg constant = 1.097 × 10⁷ m^–1)

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detailed solution

Correct option is C

For Kαline, λ=43RZ-12For λ between 250 and 179 pm 3 elements are possibleZ = 24, 25, 26.

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The number of elements in a row between those elements whose wavelength of Kαlines are equal to 250 and 179 pm is (Rydberg constant = 1.097 × 107 m–1)

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The number of elements in a row between those elements whose wavelength of $K_{α}$ lines are equal to 250 and 179 pm is (Rydberg constant = 1.097 × 10⁷ m^–1)