Tutored Practice Problem $12\mathrm{.}2\mathrm{.}1$

Relate edge length and atomic radius for a body$-$centered cubic unit cell.

Metallic tantalum crystallizes in a body$-$centered cubic lattice, with one Ta atom per lattice point. How many atoms are there per unit cell? If the edge length of the unit cell is found to be $330pm,$ what is the metallic radius of Ta in pm$?$