The correct order of the penetration effect of different orbitals is ..........

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

Which of the following elements has the last electron in its outermost orbit with a magnetic quantum number $m = 0$?

Which of the following are degenerate orbitals?
$3d_{xy}, 4d_{xy}, 3d_{z^2}, 3d_{xz}, 4d_{yz}, 4d_{z^2}$

The magnetic quantum number is related to:

Which of the following elements has the outer electronic configuration $3s^2 3p^5$?