What is the maximum number of electrons in an atom that can have the following quantum numbers?

Question

What is the maximum number of electrons in an atom that can have the following quantum numbers?
(a) n = 2, ms = -1/2

(b) n = 5, l = 3

(c) n = 2, l = 1, ml = -1

(d) n = 3, l = 2, ml = +1

Answer 1

1 2s and 2p electrons that are spinning 1-1/2 (down arrows)
4 orbitals 4 down arrows

2. 5d --> 10 electrons

3. 2px --> 2 electrons

4. 3d ?orbital...2 electrons