Total line for H atom and I2+ ion are 6,15 . But 2→1 has same energy as 3→6 in li2 *ions so total line =20 if sample is containing only H then there are 2 balmer lines in li2+ all lyman lines are in u.v=5 all balmer lines in u⋅v=4 in li2+ few more lines can be in u.v