Question

The graph below shows the atomic radii of atoms in picometers (pm) as a function of atomic number. Which region on this graph most closely shows the location of rubidium $\left(Rb\right)$?

• A. Region A
• B. Region E
• C. Region D
• D. Region C

Answer 1

Answer: (C)

Region D

Region 'A' shows 2nd-period elements.

Region 'B' shows 3rd-period elements

Region 'C' shows 4th-period elements.

Region 'D' shows 5th-period elements.

All these are classified on the fact that period '1' has 2 elements and before region 'A', there are 2 elements

Rubidium is 5th group element so it is in Region 'D'