If 27.72 mL of 0.1160 M KMnO4 was added to the solution to reach the end point, what mass of FeCl2 was in the sample

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?