The periodic table is a well-organized chart that contains all the known elements in the universe. These elements are ...
It's important to use the names and chemical symbols for the first 20 elements in the periodic table, as well as the elements in groups 1 and 7.
Elements are arranged in the periodic table in order of increasing atomic ... up to a maximum of 8 electrons (only true for the first 20 elements). Example: sodium has the electron arrangement ...