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. 2011 Dec 14;51(1):425–438. doi: 10.1021/ic2018693

Table 1. New Proposed Ionic Radii in Å of the Alkali Metal Ions.

  4-coord 5-coord 6-coord 7-coord 8-coord
Li+ 0.60   0.79    
Na+   1.02 1.07    
K+     1.38 1.46  
Rb+         ∼1.64
Cs+         ∼1.73