This page contains a Flash digital edition of a book.
atom: the smallest part of a substance that has all the traits of that substance


chemical reaction: a process in which atoms break bonds with one another or form


new bonds to create a new substance


compound: a substance created by the combination of two or more elements


element: a substance made up of only one kind of atom


This exploding star created many elements. They will drift through space for billions of years.


MARCH 2016 15 15


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