* Noble Gases: Noble gases are the elements in Group 18 of the periodic table. They are very unreactive because they have a full outer shell of electrons.
* Manganese: Manganese is a transition metal, found in Group 7. It has a partially filled d-orbital, making it reactive and not a noble gas.
However, we can use noble gas notation to represent the electron configuration of manganese:
1. Find the preceding noble gas: The noble gas preceding manganese is Argon (Ar).
2. Write the noble gas symbol in brackets: [Ar]
3. Add the remaining electron configuration: [Ar] 3d⁵ 4s²
Therefore, the noble gas notation for manganese is [Ar] 3d⁵ 4s². This notation tells you that manganese has the same electron configuration as Argon plus 5 electrons in the 3d orbital and 2 electrons in the 4s orbital.
