Which orbital has two angular nodal planes?

Which one of the following sets of quantum numbers is incorrect?

Principal quantum number $(n)$	Azimuthal quantum number $(l)$	Magnetic quantum number $(m)$

Define the principal quantum number $(n)$.

Determine the number of $d$-electrons in $Fe^{2+} (Z = 26)$.

In the following pairs,which orbital experiences greater nuclear attraction?
$(i)$ $4f$ and $5d$ $(ii)$ $4d$ and $5s$ $(iii)$ $7s$ and $5f$ $(iv)$ $7p$ and $5p$
$(v)$ $3d$ and $3f$

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