State whether the following statements are true or false:
$(i)$ Atomic size increases with an increase in the atomic number of elements.
$(ii)$ The electron gain enthalpy for noble gases is approximately zero.
$(iii)$ The first element of the actinoid series is $Th$ and the last element is $Lu$.
$(iv)$ The general electronic configuration of $d$-orbitals is always $(n-1)d^{1-10}ns^2$.

(N/A) $(i)$ False: Atomic size generally decreases across a period due to increasing effective nuclear charge.
$(ii)$ True: Noble gases have stable closed-shell configurations,making electron gain energetically unfavorable.
$(iii)$ False: The actinoid series starts with $Ac$ $(Z=89)$ or $Th$ $(Z=90)$ depending on definition,but ends with $Lr$ $(Z=103)$,not $Lu$ ($Z=71$,which is a lanthanoid).
$(iv)$ False: While $(n-1)d^{1-10}ns^{1-2}$ is common,there are exceptions like $Pd$ $(4d^{10}5s^0)$ and $Cr$ $(3d^54s^1)$.