Explain why does helium have more spectral lines

Question

1. Explain why does Helium have more spectral lines than the Hydrogen?

2. Explain would you accept the spectrum of the He+ ion to be a complex as the spectrum of He?

3. Describe will the spectrum of H₂+ resemble the spectra for any of the following species?

               a. H₂

               b. H

               c. He+

               d. He

4. Identify which of the following can be expected to give a spectrum most like that of the H atom?

               a. LI

               b. Li+

               c. Li⁺²