"An element is like one of the screen pixels that make up the image pixels - there are only three colours of screen pixel: red, green and blue. All the pictures on your TV or computer screen ultimately come from just red, green and blue and you cannot break these pixels into to any smaller pieces of other colours."The link covers the basics of chemistry well.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.