Eric Walker added ‘We are afraid’: Erin Brockovich pollutant linked to global electric car boom | Pollution | The Guardian to Hexavalent chromium, and added Hexavalent chromium to Chromium

Eric Walker added a number of topics and We found a new type of stellar explosion that could explain a 13-billion-year-old mystery of the Milky Way's elements and Is It Time to Upend the Periodic Table? - The New York Times to Chemical elements, and added Chemical elements to Chemistry and Atoms, molecules, chemicals, minerals, materials and compounds

Eric Walker added Iron chromium oxides and Hexavalent chromium to Chromium, and added Chromium to Metals and Chemical elements

Eric Walker added Chromite to Iron chromium oxides, and added Iron chromium oxides to Iron oxides, Minerals and gems and Chromium

Eric Walker added a number of topics and a number of links to Metals, and added Metals to Atoms, molecules, chemicals, minerals, materials and compounds