Salut Joziga, welcome to Wikipedia. Thank you for contributing.
I do have a concern, though. You are pasting IUPAC definitions into various articles. I am afraid these texts are copyrighted. Unauthorized reproduction of these texts is in violation of the law, and of Wikipedia rules.
Unless you produce convincing reasons why I am wrong, I'd ask you to quickly revert all those edits. -- Nsda (talk) 14:36, 18 July 2019 (UTC)
Hello Joziga. I am Diannaa and I am a Wikipedia administrator. Unless the copyright holder (the IUPAC in this case) releases the material under a compatible license, we can't accept copyright content. We need to have documentation that shows they have given permission for their material to be copied to this website. Wikipedia has procedures in place for this purpose. Please see WP:Donating copyrighted materials for an explanation of how to do it. There's a sample permission email at WP:Consent. — Diannaa 🍁 (talk) 20:16, 22 July 2019 (UTC)