The periodic table brings order to information about the chemical elements. It helps chemists to understand why elements react as they do.
What you need to know before you start this task:
You should understand the meaning of element, compound, atom [atom: All elements are made of atoms. An atom consists of a nucleus containing protons and neutrons, surrounded by electrons.] and molecule.
You should know that each element is represented by a symbol.
An example of a group in the periodic table is the alkali metal [alkali metals: The alkali metals are the elements in Group 1 of the periodic table. They have one electron in the outer shell.] group. This video clip shows some of the reactions that occur with this group.
Video: Alkali metals
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