What is the atomic mass to astatine?
Astatine has 33 isotopes, all radioactive and consequently unstable, with short half lives (the most stable isotope has a half life of 8,1 hours); therefore it is more correct to indicate the atomic mass of each isotope.
For this see the link: http://en.wikipedia.org/wiki/Isotopes_of_astatine.
Atomic radius (calculated) of astatine: 127 pm Covalent radius (2008 values) of astatine: 150 pm Atomic radius (empirical) of tellurium: 140 pm Atomic radius (calculated) of tellurium: 123 pm Covalent radius (2008 values) of tellurium: 138 pm Covalent radius (empirical) of tellurium: 135 pm van der Waals radius of tellurium: 206 pm Data from WebElements: http://www.webelements.com/tellurium/atom_sizes.html. Atomic radius of astatine: 127 pm Covalent radius of astatine: 150 pm