The history of the stars accounts for the formation of elements.
Sidebars define basic terms and detail how two theories united to explain the origin of elements.
Mendeleyev organized the elements according to their properties. His mother, Maria, worked hard to support his education and career. One sidebar explains how atomic theory relates to the Periodic Table. A second mentions the contributions of some women scientists to the study of elements. 15 Use the Periodic Table to solve a mystery.