Tom-the-Atom represents the Carbon Atom, the most crucial atom in the Universe. A series of illustrated science books for children and adolescents. The young reader will become familiar with the world of atoms, which make up all the material in the Universe; the Earth, the planets, the stars, and you and me. The young reader is invited to become part of the World of Atoms and to develop his/her understanding of how atoms form everything. Tom-the-Atom, Book 5: On weekends, we play with the concepts we learned!Mary, Henry, and their friends review the concepts they have learned when visiting the World of Atoms. Henry and his friends review the concepts of covalent bonds among Carbon Atoms. Mary and her friend research the water molecule.