Question

attempt the following questions elements: K,Na,Rb,Cs,Li. Atomic radius (pm) 231,186,244,264,152

Answer 1

we know, The atomic radii of elements increase with an increase in atomic number from top to bottom in a group. As we move down the group.

here, we have given group I
K, Na , Rb , Cs , Li
regular order based on atomic number of group I is ..
Li < Na < K < Rb < Cs

so, order of atmic radii : Li < Na < K < Rb < Cs

so, you can get answer easily now,
atomic radius of Li = 152pm
atomic radius of Na = 186pm
atomic radius of K = 231pm
atomic radius of Rb = 244pm
atomic radius of Cs = 264pm