Treptilian

Consider the following compounds: KF, NaF, and RbCl. Answer the following questions based on expected periodic trends: (a) Which is expected to have the shortest ionic bonds? (b) Which is expected to have the highest lattice energy? (c) Which is expected...

The maximum number of orbitals that may be associated with the quantum numbers n = 5 and l = 2 is So i got 9 for this question, but was marked wrong, and I am not quite sure why? Thanks in advance