It might be in sub Angstram in size I hope.

Atomic radius is important in the crystal structure prediction. Here, zeolites prime concern is to catalytic activity. For example, silicalite does not have catalytic activity. In silicalite, the neighbor silica T share atom replace by other substitutions can enhance charge density (ionic character) at particular crystal lattice. My suggestion that molecular structure of zeolites prediction is better in terms of active sites rather atomic radii of selective elemental participation. Alternatively, columbic force of attraction anomaly with ionic substitution, therefore chemical bond formation between T atoms share differ from one another. Consequently, energy of crystal lattice can be varied. However, the core shell share between Si4+ orbital and formal charge participation of P orbital serious like Al3+, P5+ and V5+ ions along with oxygen lattice are to similar fashion in zeolites. Therefore, the chosen element core shell re-activity of TO4 bond formation has more concern than ionic radii. Moreover, atomic radii of certain elements in zeolite are not restriction for crystal structure constrains due to its porous nature, but those of radius ratio is not extend in its crystal coordination limits. This fact excludes angstrom importance in zeolites structure studies. Sub angstrom unit means is that would you recommend beyond nano level. Please explain your question to share better discussion.

You can find values of the ionic radii of most elements at the following website:

http://abulafia.mt.ic.ac.uk/shannon/ptable.php

Please also have a look at the accompanying literature (Shannon's original paper and later discussions).

please see the attached file.I hope it can be helpful to you

source:crystalmaker.­com

Thanks for the above answer. If the atoms and bonds are visible through an advanced microscope, I hope it will help to understand various molecules.

Dear Mohadese,

Thanks for the your contribution, but the attached table presents a unique number for ionic radii of each element.

It is somehow vague, for instance, Fe cation, can be Fe2+ or Fe3+.

The value in the table corresponds to which of these ions?

Thanks Fischer.