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Frequency of a photon emitted due to transition of electron of a certain elemrnt from \( \mathrm{L} \) to \( \mathrm{K} \) shell is found to be \( 4.2 \times 10^{18} \mathrm{~Hz} \). Using Moseley's law, find the atomic number of the element, given that the
P Rydberg's constant \( \mathrm{R}=1.1 \times 10^{7} \mathrm{~m}^{-1} \).

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