Identify the nodal plane present in the $p_y$ orbital.

The quantum numbers $+1/2$ and $-1/2$ for the electron spin represent

An electron has a magnetic quantum number of $-3$. Its principal quantum number can be

The number of waves made by a Bohr electron in an orbit of maximum magnetic quantum number $3$ is

Which of the following orbitals has the least energy?

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