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 ...

that water is a chemical compound made up of two hydrogen atoms and a single oxygen atom or H 2 O. For thousands of years, water was thought to be an element. That is, until some of the greatest ...

INSERT[UUPT_CM_CI08_ani] MM looks at origins of the concept and word atom as defined by Democritus ... in a later topic and which enables us to develop our definitions of an element.

When teaching students about elements and compounds, it is often necessary to present various models to ensure that all students have a thorough grasp of the concepts. A model that works for a ...