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Introduction page 1
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Picture 1 There are over 100 elements.
Atoms are, we think, the basic building blocks of matter. We know of over a hundred different types of atom - one for each of the elements *.

So what are atoms? Do they have anything inside them? And where did they come from? In this electronic resource (e-source) we will try to answer these questions.

* In 2002, there are 115 known elements. However, those above 109 are highly unstable and have been made in only tiny quantities.

Contents
The e-source is split into 4 chapters:
  1. What are we made of?
  2. Inside the atom
  3. Splitting atoms
  4. Back to the beginning

Using this e-source
There are a number of interactive features in this e-source:

A glossary of terms: any word with a glossary entry is highlighted like that. Clicking on the word will open a new window with a definition of that word.

Quick questions: at the end of each page is a quick question to test your understanding of that page. Type in your own answer then click on the button to see how well you did.

Quiz: at the end of each unit, there is a quick quiz to see how well you understand the ideas.

Roll over diagrams: many of the diagrams have highlights or sequences. You can see these by rolling your cursor over part of the picture or part of the text. The text has a roll over highlight like that.

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