Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom. Iron is an ...

Elements and Compounds: Understanding elements and compounds is basic knowledge to study chemistry. Elements are the basic building blocks of matter, while compounds are substances formed when two or ...

Silicon dioxide, or silica, is a natural chemical compound composed of silicon and oxygen (SiO₂). It is typically safe as a food additive, although some agencies are calling for stricter guidelines ...

Silicon dioxide is found naturally in the ground and in our bodies. There isn’t evidence that it’s dangerous to ingest it through food, but inhaling its dust particles could lead to lung problems.