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Common household lye (such as Drano) is a typical alkali.
Its density is 0.862 grams per cubic centimeter, less than that of water (1.00 grams per cubic centimeter).
The alkali metals are the elements that make up Group 1 (IA) of the periodic table.
The periodic table is a chart that shows how chemical elements are related to one another.
In electrolysis, an electric current is passed through a molten (melted) compound.
The electrical current breaks the compound into its elements.
Then Davy thought of another way to separate potash and soda ash into their elements. Instead, he melted a sample of potash and a sample of soda ash.