Electron Configuration Notation:

-shows the arrangment of electrons around the nucleus of an atom.

- helps chemist understanding how elements form chemical bonds.

- can be written using the period table or an electron configuration chart.

How to Write the Electron Configuration for Helium

Since Helium only has 2 electrons it is one of the the simplest electron configurations to write. Essentially there are just two electron around the Helium nucleus.

Video: Helium Electron Configuration Notation

Helium only has 2 electrons and therefore it has a configuration of 1s2. Because the 1s orbital is full with 2 electrons and any additional electrons would go in a new energy level. The electron configuration for Helium shows a full outer shell and is Helium is therefore called a Nobel Gas. This means it will not react with other atoms.