Atomic radius | Quantum Theory and Atomic Structure

1) Arrange the following elements in order of increasing atomic radii: K, Na, Mg, Cs, Cl.

2) Arrange the following set of ions in order of decreasing ionic radii: Al3+, Ga3+, Ca2+, Rb+, K+

1) Cl < Mg < Na < K < Cs

2) Rb+ > K+ > Ca2+ > Ga3+ > Al3+