9. Quantum Mechanics

What is the maximum number of electrons that can have the principal quantum number n = 3 in an atom?

Which of the following sets of quantum numbers is not allowed for an electron in an atom?

What is the maximum number of electrons that can have the principal quantum number n=2 in an atom?

What is the maximum number of electrons that can occupy the third energy level (n = 3) in an atom?

What is the maximum number of electrons that can have principal quantum number n = 3 and spin quantum number ms = +1/2?

For the quantum numbers n = 3 and l = 2, how many orbitals are described by this combination?

What is the maximum number of electrons that the d-sublevel can hold?