Atoms of group 1 elements have one electron in their outer shell, and atoms of group 2 ... See the study guide on groups in the periodic table for more information.

For all their nobility, elements of group 18 have lived in relative obscurity. In 1869, Mendeleev's first periodic table did not include them, as closed-shell elements remained undiscovered until ...

Uranium, belonging to the periodic table's actinide elements, has long intrigued scientists due to its complex electron configurations ... electrons in its inner shells compared to other, more ...

Some elements in the periodic table, such as carbon, silicon, and germanium, are intrinsic semiconductors due to the number of electrons in their outermost electron shells. By comparison ...