Norman Campbell discusses the problem of the possible consistency of the assumptions about the motion and arrangement of electrons in the atom underlying ... theory of atomic structure, and ...

The nucleus is very small compared to the atom as a whole: as electrons are even smaller, most of an atom is empty space the diameter of a nucleus can be 100,000 times less than the diameter of an ...

(London and Toronto: Hodder and Stoughton, Ltd., 1923.) 2s. 6d. net. (2) The Atom and the Bohr Theory of its Structure: an Elementary Presentation. By H. A. Kramers Helge Holst. Translated from ...

The “lead” of a pencil is actually made of a substance called graphite which is made of carbon atoms. The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and ...