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The wavelength of Lalpha line in X-ray s...

The wavelength of `L_alpha` line in X-ray spectrum of `._76Pt` is 1.32Å. The wavelength of `L_alpha` line in X-ray spectrum of another unknown element is 4.17Å. If screening constant for `L_alpha` line is 7.4, then atomic number of the unknown element is

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