Many inorganic chemists focus on the transition metals—the elements in the middle of the periodic table. The transition metals include most of the metals you are familiar with, like iron (Fe) and gold ...

The ions formed have a full outer electron shell, so are very stable. See the study guide on groups in the periodic table for more information.

Nitrogen on periodic table of the elements. Do you remember how many elements there are in the periodic table? Spoiler: it’s probably different than you remember if you went to school before 2010.