Arrange the following in increasing order of their atomic radius : \[Na,\,K,\,Mg,\,Rb\] [AFMC 1995, 97; CPMT 1999]

Arrange the following in increasing order of their atomic radius : \[N

1.	Arrange the following in increasing order of their atomic radius : \[Na,\,K,\,Mg,\,Rb\] [AFMC 1995, 97; CPMT 1999]
A.	Mg < K < Na < Rb
B.	Mg< Na < K < Rb
C.	Mg < Na < Rb < K
D.	Na < K < Rb < Mg
Answer» C. Mg < Na < Rb < K