Sn radii

Radii in AngstromsShannon radii from Acta Crystallographica. (1976). A32, 751-767 Sn(II) radius not given by Shannon, value used is from G. Kieslich , S. Sun and A. K. Cheetham , Chem. Sci., 2015, 6 , 3430 —3433
Halide radii from Chem. Sci., 2016,7, 4548-4556