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+2 votes
by kratos
 
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The energies of the stationary states for hydrogen-like species such as Li2+, He+, etc. are an integral multiple of Z2 times the energies of the stationary states for hydrogen atoms, in similar transitions.

Hence, the wave number of the first Balmer line of Li2+ ion = 32 x 15200/cm = 9 x 15200/cm = 136800/cm.

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