(A) The electronic configuration of $Li$ is $1s^2 \, 2s^1$,so $Li^{2+}$ has the electronic configuration $1s^1$.Bohr's model and the resulting spectra

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(A) The electronic configuration of $Li$ is $1s^2 \, 2s^1$,so $Li^{2+}$ has the electronic configuration $1s^1$.Bohr's model and the resulting spectra are applicable to hydrogen-like species,which contain only one electron.Since $Li^{2+}$ has only one electron,its spectrum is similar to that of the hydrogen atom $(H)$,which also has the configuration $1s^1$.