Question: What German theoretical physicist has a chemistry rule named after him?
Context: Werner Döring (2 September 1911, Berlin – 6 June 2006, Malente) was a German theoretical physicist.  From 1963 until his retirement in 1977, he was ordinary professor at the University of Hamburg.  His main interest was the theory of magnetism.  His textbooks on theoretical physics have influenced several generations of students. Werner Nahm (born 21 March 1949 in Münster (Selters), Germany) is a German theoretical physicist, with the status of professor.  He has made contributions to mathematical physics and fundamental theoretical physics. Emil Julius Klaus Fuchs (29 December 1911 – 28 January 1988) was a German theoretical physicist and atomic spy who, in 1950, was convicted of supplying information from the American, British, and Canadian Manhattan Project to the Soviet Union during and shortly after the Second World War.  While at the Los Alamos National Laboratory, Fuchs was responsible for many significant theoretical calculations relating to the first nuclear weapons, and later, early models of the hydrogen bomb. Arnold Johannes Wilhelm Sommerfeld, {'1': ", '2': ", '3': 'ForMemRS', '4': "} (] ; 5 December 1868 – 26 April 1951) was a German theoretical physicist who pioneered developments in atomic and quantum physics, and also educated and mentored a large number of students for the new era of theoretical physics.  He served as PhD supervisor for many Nobel Prize winners in physics and chemistry (only J. J. Thomson's record of mentorship is comparable to his). Siegfried Flügge (16 March 1912, in Dresden – 15 December 1997, in Hinterzarten) was a German theoretical physicist and made contributions to nuclear physics and the theoretical basis for nuclear weapons.  He worked in the German "Uranverein" (nuclear weapons project).  From 1941 onward he was a lecturer at several German universities, and from 1956 to 1984, editor of the 54-volume, prestigious "Handbuch der Physik". Walter Greiner (29 October 1935 – 6 October 2016) was a German theoretical physicist.  His research interests lied in atomic physics, heavy ion physics, nuclear physics, elementary particle physics (particularly in quantum electrodynamics and quantum chromodynamics).  He is known for his series of books in theoretical physics, particularly in Germany but also around the world. Olaf Dreyer (born 1969 in Hamburg) is a German theoretical physicist whose research interests include quantum gravity and the quantum measurement problem.  Dreyer received his Ph.D. in quantum gravity in 2001 from the Pennsylvania State University under the direction of Abhay Ashtekar.  Subsequently, he has held a postdoctoral fellowship at the Perimeter Institute for Theoretical Physics in Waterloo, Ontario, a Marie Curie Fellowship at Imperial College, London, and a postdoctoral fellowship at the Center for Theoretical Physics, Massachusetts Institute of Technology. Bianca Dittrich (born 1977) is a German theoretical physicist known for her contributions to loop quantum gravity and the spin foam approach to quantum gravity.  She is a faculty member at Perimeter Institute for Theoretical Physics in Waterloo, Ontario, Canada since 2012.  She is also an adjunct professor at the University of Guelph and the University of Waterloo. In chemistry, the Grimm–Sommerfeld rule predicts that binary compounds with covalent character that have an average of 4 electrons per atom will have structures where both atoms are tetrahedrally coordinated (e.g. have the wurtzite structure).  Examples are silicon carbide, the III-V semiconductors indium phosphide and gallium arsenide, the II-VI semiconductors, cadmium sulfide, cadmium selenide. Siegfried Grossmann (born 28 February 1930) is a German theoretical physicist who has been awarded the Max Planck Medal, the major prize for achievements in theoretical physics.
Answer: Arnold Johannes Wilhelm Sommerfeld