1. What is the total mechanical energy for a ground- state electron in H, He+, and Li++ atoms? For which atom is the electron most strongly bound? Why?
2. A hydrogen atom in an excited state absorbs a photon of wavelength 410 nm. What were the initial and ?nal states of the hydrogen atom?
3. A hydrogen atom in an excited state emits a photon of wavelength 95 nm. What are the initial and ?nal states of the hydrogen atom?