Which orbital among the following has zero radial nodes and $2$ angular nodes?

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 :

When the azimuthal quantum number has a value of $l = 1$,the shape of the orbital is

Which pair of atoms or ions will have the same electronic configuration?

The principal quantum number $(n)$ represents:

The electronic configuration (outermost) of $Mn^{2+}$ ion (atomic number of $Mn = 25$) in its ground state is