(2002 117 which emphasizes trends and patterns, and unusual chemical relationships and properties. 125 Finally, hydrogen is sometimes placed separately from any group; this is based on its general properties being different from those of the elements in any other group. Archived from the original on Thyssen,.; Binnemans,. The combination of horizontal and vertical trends in metallic character explains the stair-shaped dividing line between metals and nonmetals found on some periodic tables, and the practice of sometimes categorizing several elements adjacent to that line, or elements adjacent to those elements, as metalloids. A b Scerri,. Read More Element 21: Scandium Scandium is mined from one of the rare minerals from Scandinavia making it a rare earth element. C.,.; Selbin,. 135 Lanthanum and actinium La and Ac below Y Lanthanum and actinium are commonly depicted as the remaining group 3 members.
Advanced application of Periodic table. The newest and most reliable information on the elements. Interactive and user-friendly interface.
Hydrogen is the first and most basic amongst all the elements in the universe. SanDiego: Harcourt Brace Jovanovich,. . Still in period 6, ytterbium was assigned an electron configuration of Xe4f135d16s2 and lutetium Xe4f145d16s2, "resulting in a 4f differentiating electron for lutetium and firmly establishing it as the last member of the f-block for period 6". Dashes represented elements unknown in 1871. In 1949 Glenn.