Summary The emergence of quantum theory in the early decades of the twentieth century was accompanied by a wide range of popular science books, all of which presented in words, and a few in images, new scientific ideas about the structure of the atom. The work of physicists such as Ernest Rutherford and Niels Bohr, among others, was pivotal to the so-called planetary model of the atom, which, still today, is used in popular accounts and in science textbooks. In an (...) attempt to add to our knowledge about the popular trajectory of the new atomic physics, this paper examines one book in particular, co-authored by Danish science writer Helge Holst and Dutch physicist and close collaborator of Niels Bohr, Hendrik A. Kramers. Translated from Danish into four European languages, the book not only explained contemporary ideas about the quantum atom, but also discussed unresolved problems. Moreover, the book was quite explicit in identifying the quantum atom with the atom as described by Bohr's theory. We argue that Kramers and Holst's book, along with other ‘atomic books’, was a useful tool for physicists and science popularisers in trying to understand the new quantum physics. (shrink)