BY D. R. HARTREE,
F.R.S., Cavendish Laboratory, Cambridge
1. INTRODUCTION
HE structure of an atom as a whole has two aspects, the structure of the nucleus of protons and neutrons, and the structure of the extra-nuclear T system of electrons ; and to a good approximation these structures can be considered independently. This article is concerned entirely with the calculat?on of the extra-nuclear electronic structure ; the nucleus of an atom, of atomic number N, will be considered simply as a point charge Ne, and, unless the contrary is specified, of infinite mass.
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