Question

Identify the pair with the smallest and the largest atomic radius in periodic table.

• A. $F,Cs$
• B. $He,I$
• C. $Li,Rn$
• D. $H,Cs$

Answer 1

The correct option is D $H,Cs$

• Atomic radius is the distance from the centre of the nucleus to the outermost shell containing electrons.
  
• Hydrogen is having the smallest atomic radius in the following pairs in periodic table.
  
• Caesium is having the largest atomic radius in periodic table.
  
• Hence option D is the correct pair.