The atomic number of the element tin which belongs to 5th period is

Tin is a chemical element with the atomic number 50 and the symbol $\mathrm{Sn}$(derived from the Latin stannum). It belongs to the periodic table's group 14 of post-transition metals. The mineral cassiterite, which includes stannic oxide ${\mathrm{SnO}}_2$, is the main source of it.
It corresponds to period 5 and group 14.