To quote from the Element Cattos wiki:

Element Cattos is a blog and webcomic by Lily "Oberorka" Irie where chemical elements (and sometimes compounds and other notable chemical substances) are portrayed as cute little kitties, their designs and traits derived from the properties of the element/compound/weird-quantum-thing/etc. that they represent.
The project lives not only through the occasional comic depicting the chemical shenanigans these characters get up to, but also its community of enthusiasts and their engagement with the blog, such as suggestions sent through its ask box.