1- Give the electron configurations of the following
species:
He, C, O, O 2-, F -, Ne, Na+, Al, Cl, Ca, Cr, Fe, and Cu
which of the above species are isoelectronic, that is those with
the same configuration?
2- What are the allowable spins, m s ?
3- How many lines are observed in the visible atomic line
spectrum for the H atom