Can answer these two questions asap ill give brainlest

Nonpoint source pollution is difficult to control because it

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?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work