State whether the following statements are true or false:
$(i)$ As the atomic number increases in a period,the nuclear charge increases,therefore the ionization enthalpy increases.
$(ii)$ As the metallic character of elements increases,the atomic radius generally increases.
$(iii)$ $Mn$ $(Z = 25)$ is a transition element. Although it is a $3d$-orbital element,its position in the periodic table is in the $4^{th}$ period.

(A) $(i)$ True: Across a period,the effective nuclear charge increases,which pulls the electrons closer,making it harder to remove an electron,thus increasing ionization enthalpy.
$(ii)$ True: Metallic character is associated with the ability to lose electrons,which correlates with larger atomic radii as one moves down a group.
$(iii)$ True: $Mn$ has the electronic configuration $[Ar] 3d^5 4s^2$. The principal quantum number $n = 4$ indicates it belongs to the $4^{th}$ period.