They are optional, so just choose what interests you. You will find them in the sidebars of each Layers of Learning unit. Additional LayersĪdditional Layers are extra activities you can do or tangents you can take off on. The periodic table of the chemical elements was created in 1869 by Dimitri. ![]() This exercise is not intended to help kids memorize the periodic table, but rather to learn what the symbols mean and how to interpret them, so they can reference the table when they need information later. Do you find learning chemistry is difficult. How many electrons are in the outer shell of the Halogen gasses?. ![]()
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