The wave number of the first line of Balmer series of hydrogen is \( 15200 \mathrm{~cm}^{-1} \)....

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The wave number of the first line of Balmer series of hydrogen is \( 15200 \mathrm{~cm}^{-1} \). The wave number of the first Balmer line of \( \mathrm{Li}^{2+} \) ion is
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