Prepare a set of about twenty-five cards, each with the name, symbol, weight, and number of electrons and protons of a common atom.

Arrange the cards according to one or more of the characteristics listed on the cards.

Then, arrange the atoms (cards) by weight, from lightest to heaviest.

Then arrange them by the number of electrons and protons they contain, beginning with the one containing the fewest electrons and protons and the ending with the atom containing the most.

You might also be interested in learning about the work of Jons Berzelius (1779-1848), a Swedish chemist who worked out a system of atomic weights.