Trends in Electronic Configuration Chemistry Tutorial
- Electronic configuration is also referred to as electron configuration.
- If you consider the electronic configuration of an atom of each element in the Periodic Table you will see a number of patterns which are referred to as periodic trends, or just trends.
- Trends in number of valence electrons (electrons in the highest energy level):
⚛ Elements in the same Group of the Periodic Table have the same number of valence shell electrons (electrons in the highest energy level).
⚛ Going across a period of the Periodic Table from left to right the number of valence electrons increases.
- Trends in energy of valence electrons:
⚛ The valence shell electrons of elements in the same Period of the Periodic Table occupy the same energy level (shell).1
⚛ Going down a Group of the Periodic Table from top to bottom, the energy of the valence shell electrons increases.