The number of radial nodes in $3s$ and $2p$-orbitals, respectively are

The orbital angular momentum of an electron in an $s$ orbital is

The electrons,identified by quantum numbers $n$ and $l$ as $(i) n = 4, l = 1$,$(ii) n = 4, l = 0$,$(iii) n = 3, l = 2$,$(iv) n = 3, l = 1$,can be placed in order of increasing energy,from the lowest to highest,as:

Which of the following electronic configurations is incorrect?

The $71^{st}$ electron of an element $X$ with an atomic number of $71$ enters into the orbital:

The number of radial node/s for $3p$ orbital is: