Here's an animation of a carbon atom
Also, look at this short slideshow which explains the unique properties of the carbon atom
(If you don't understand totally, that is all right -- the main thing to understand is that carbon bonds with other elements in an unusual way -- it can form chains, rings, double and triple bonds -- in fact, very complex structures that are necessary for life).
Review
Try this Balancing Quiz
(choose "easy")
Try this Element Matching Game
KTR
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