Inside the Atom is a popular science book by American author Isaac Asimov and describes the internal structure of the atom. The sequence of concepts described in the book follows their historical discovery. The author describes the various sub-atomic structures within the atom, and the functions they fill in the whole structure. Later chapters describe chemical elements and isotopes, the stability and instability of atomic nuclei, and finally atomic energy, the uses it has, and the threat that it poses. The book is aimed at educated lay-readers, and high-school science students.