What happens to a scientific theory if new data show a flaw in one assumption of a theory?

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

What is a number added in front of a formula in order to balance the equation