Unit 3: The Periodic Table of Elements

The elements, what are they? How many are there? How do we tell them apart? How do they behave? Who cares? Why do we care? You are made of enough iron to create a small box of nails, enough copper to create part of a penny, enough phosphorus to fill a few boxes of matches, and enough carbon to create a few bags of charcoal. Each element is a specific type of atom, and these bits of matter are found on Earth, in your body, and everywhere in the universe.

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