Its atomic radius is 0.248 nm and the (+1) ionic radius is 0.148 nm. In the solid state Rubidium has a body-centered cubic crystal structure with a = 0.562 nm and a nearest neighbor distance of 0.478 ...
The electronic configuration of Zirconium is (Ar)(4d 2)(5s 2). Its atomic radius is 0.160nm and the (+4) ionic radius is 0.080 nm. In the solid state Zirconium has a hexagonal-close-packed crystal ...