Aids burning. Found in air. Used to treat breathing problems A compound is a substance that contains atoms of two or more different elements, chemically joined together. For example, water is a ...

Scientists have coaxed one of the universe’s most stubborn elements into a new compound. Formed under intense pressures, the newly discovered compound packs helium atoms into crystalline iron ...

And that’s it! Nearly everything in this room, in your room, and in the entire universe, is made of: elements with one kind of atom, compounds containing different types of atoms chemically ...