Electrons in atoms occupy energy levels, also called electron shells, outside the nucleus. Different shells can hold different maximum numbers of electrons. The electrons in an atom occupy the ...

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.

The periodic table captures a subtle pattern ... number of electrons that orbit in the shell furthest form the nucleus. It is the arrangement of these electron orbits that is reflected in the ...

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 ...