User talk:103.74.146.40

July 2021
Hello, I'm DMacks. I noticed that you added or changed content in an article, List of chemical elements, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at referencing for beginners. If you think I made a mistake, you can leave me a message on my talk page. This article is for already-confirmed elements, not hypothetical ones that have never actually been made. DMacks (talk) 17:12, 6 July 2021 (UTC)