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 $3f$

(N/A) $(i)$ $4f$ experiences greater attraction because for both $4f$ and $5d$,$(n+l) = 7$,but $4f$ has a lower principal quantum number $n$.
$(ii)$ $5s$ experiences greater attraction because for $4d$,$(n+l) = 6$,while for $5s$,$(n+l) = 5$. Lower $(n+l)$ value indicates stronger attraction.
$(iii)$ $7s$ experiences greater attraction because for $7s$,$(n+l) = 7$,while for $5f$,$(n+l) = 8$.
$(iv)$ $5p$ experiences greater attraction because both are $p$-orbitals,but $5p$ has a lower principal quantum number $n$ compared to $7p$.
$(v)$ $3f$ does not exist,so $3d$ is the only valid orbital.