Question

The correct decreasing order of atomic radii (pm) of Li, Be, B and C is 

(1) Be > Li > B > C 

(2) Li > Be > B > C 

(3) C > B > Be > Li 

(4) Li > C > Be > B

Answer 1

Correct option is (2) Li > Be > B > C 

As the atomic number in a period increases, the effective nuclear charge also increases hence, atomic radii along the period decreases. 

Correct order of atomic radii 

Li > Be > B > C