I am currently working on a periodic table to include it in a experimental chemistry book and I would like to include non-bonded atomic radii data so it would be easier for the students to learn about periodic trends and quickly determine if an atom is more likely to produce a hard or a soft Lewis acid-base.
The problem is that every reference I looked have different values for the same atom. For instance, see the results for Hydrogen and Gold non-bonded atomic radii below:
- In this site we have: 0.53 (H) / 1.74 (Au) Å
- In RSC site, we have: 0.32 (H) / 1.30 (Au) Å
- This aricle (Slater, 1964 - see the DOI below): 0.25 (H) / 1.35 (Au) Å
- Finally, in Wikipedia (which is the result Google will return if you type the search query "hydrogen/gold atomic radius") is: 0.53 (H) / 1.66 (Au) Å
These differences are observed in most elements. I do not know which one is more reliable. In my point of view, variations of 0.20 angstrons are too big in atomic scale, aren't they?
What do you think about what cause those variations? Are they significant? Could someone help me to find a reliable source for atomic radii data?
Maybe those variations occur due to statistical deviations from the method used to measure them, but could it be so big (about 20%)?
Slater, 1964. DOI: 10.1063/1.1725697