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 atomic radius of Magnesium $\left(Mg\right)$?

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

Answer 1

The correct option is B Region B

Here region A shows 2nd-period elements. Because, before 'A' region only one element is there. It is of 1st period. 2nd-period element 'Li' lies in REGION 'A'.

Magnesium lies in the third period. Thus, it must be in Region B.