Quantum Numbers Questions

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?(a) $n=1,l=0,m=0$ (b) $n=2,l=0,m=0$ (c) $n=2,l=1,m=1$ (d) $n=3,l=2,m=1$ (e) $n=3,l=2,m=0$

Which of the following sets of quantum numbers represents the highest energy of an atom?

Which of the following sets of quantum numbers is correct for an electron in a $4f$ orbital?

The electrons identified by quantum numbers $n$ and $l$:(a) $n=4,l=1$ (b) $n=4,l=0$ (c) $n=3,l=2$ (d) $n=3,l=1$ Can be placed in order of increasing energy as: