Article describing the discovery of rhenium and technetium by Walter Karl Friedrich Noddack and Ida Eva Noddack-Tacke. Information regarding pertinent locations is included.

Article describing Axel Fredrik Cronstedt and his discovery of nickel. Information regarding pertinent locations is included.

Article describing Joseph Black and his discovery of magnesia and fixed air. The authors toured Edinburgh, Scotland in search of locations important to Black, providing the reader with maps and historical information regarding the sites.

Article describing Frederick Soddy's career and research of isotopes. Tourist information is included for areas significant to Soddy's life and work.

Article describing Jedrzej Sniadecki's career and his flawed findings regarding vestium. Tourist information is included for areas significant to Sniadecki's life and work.

Article describing the career of Henry Moseley and his findings regarding atomic numbers. Tourist information is included for areas relevant to Moseley.

Article describing the discovery of helium in the sun and on Earth via spectroscopy. Tourist information is included for areas significant to those involved.

Article describing the nearly simultaneous discovery of thallium by William Crookes and Claude-August Lamy. Tourist information is included for areas in London, England, and Lille, France, that are significant to the lives of these two men.

Article describing the career of Marie Curie and the discovery of polonium and radium. Tourist information regarding the areas where the Curies were most active are included.

Article describing the discovery of argon, helium, and other inert gases by Lord Rayleigh, Sir William Ramsay, and other collaborators. Ramsay also characterized the noble gases and classified them within the structure of the Periodic Table of Elements.

Article describing the history of the discovery of radon. Tourist information is included for areas significant to radon and its discoverers.

Article describing the search for element 72, the scientists involved, and the nationalist politics surrounding the discovery. Tourist information is included for areas significant to the history of hafnium.

Article describing the importance of the Harz Mountains and the University of Göttingen in the discovery of cadmium and thallium. Tourist information regarding the area is included.

Article describing Daniel Rutherford's discovery of nitrogen. The article also details the work of other scientists revolving around the discovery of nitrogen.

This article explores the rare earths, the chemically similar elements that occupy the f-block of the Periodic Table and the Group III chemical family. The articles shows the locations that certain rare earths were originally found. It also gives details on where the elements can be found currently, as well as major production areas. The cover of the Fall 2015 Hexagon journal (Vol. 106, Issue 3) features the Mountain Pass rare earth ore body in Southern California, which is mentioned in the article on pages 40-45 of the journal. A description of the photo on the cover of the journal can be found on page 38.

This article gives a timeline of research conducted on the rare earths, 17 elements found in the f-block and Group III chemical family of the Periodic Table. It covers discoveries made after the success of Swedish chemist, Carl Gustaf Mosander. The article describes the categorization of the rare earths that took place after Mosander's time, as well as separation techniques that developed.

Article provides information on the history of alkalis, particularly discoveries associated with potassium and sodium. The article also gives information on Humphry Davy, the first person to prepare alkalis in elemental form.