![]() An element is a substance made up of all the same type of atom. Explain to students that an atom is the smallest particle or “building block” of a substance. Note: It is often confusing for students to see the terms “atom” and “element” used interchangeably as if they are the same thing. The 100 or so atoms of the periodic table, in different combinations, make up millions of different substances. It’s kind of like the alphabet in which only 26 letters, in different combinations, make up many thousands of words. The periodic table shows all the atoms that everything in the known universe is made from. Explain that each box contains information about a different atom. Tell students that this is the periodic table.
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