# What reference does this set of covalent radii come from? [closed]

I have encountered this set of covalent radii, on EnvironmentalChemistry.com. I am very curious what source the data come from, which they do not mention. For example, who put forward this set of data in which journal in which year?

PS: The values mentioned above look like (Å):

0.32                                0.93
1.23 0.90 0.82 0.77 0.75 0.773 0.72 0.71
......


PS: Part of the values have even appeared on Advanced Inorganic Chemistry. So this set of value should be quite official.

PS: The data is used in the "add_mesh_cluster.py" of blender - 2.65 of "Fresh Open Source Software archive". Sorry I am limited up to two links in the post.

PS: Other data exist. For example, the covalent radii Wikipedia page, data come from one Dalton Transactions article. Differences exist. For example, for He, this set gives 0.28 Å.

-
 I'm sorry, but if you want to find how some other website got its information, this isn't really the place for it. On the other hand, if you want links to any research papers containing the data, it's fine--but it seems you already have such things, going by your last "PS". See the faq to know what kind of questions we allow here. – ManishEarth♦ Dec 15 '12 at 8:04 Probably I didn't make it clear. I said "other data exist, from wikipedia for example." I want links to the research papers containing the data mentioned at the first paragraph. These are different sets of data. I hope it is clear now and please open the question. – Alex Noack Dec 15 '12 at 10:12 Well, I still feel that it's off topic. We sort of allow reference requests (they're borderline on topic), eg "Tell me which paper I can find X in", but here you want us to find a rather specific data sheet with a specific "version" of the data. That's (a) rather localized, and (b) still off topic. Sorry :/ – ManishEarth♦ Dec 15 '12 at 15:58 What I want from you is to open this question, which you closed by misunderstanding, so that other people might help if they know the answer and are willing to help with my question, which does not violate anything just as you mentioned in the first place. Please don't let your ego show like this. – Alex Noack Dec 15 '12 at 21:50 I did not close by misunderstanding. Let me make this clear: A question asking for a datasheet about X is OK. A question asking for us to hunt for a specific paper with specific values for that data, is really off topic. As well as being too localized. Initially, when I said any research papers containing the data, I meant "any research paper that contains atomic radius data", not "any research paper containing this specific version of the data". Sorry about that, but this question is still off topic and too localized. We're not here to do your Googling for you. – ManishEarth♦ Dec 16 '12 at 8:23