What is the noble gas configuration of bromine

Noble Gas Configuration of Bromine

The noble gas configuration of bromine can be identified by referencing the noble gas that precedes bromine on the periodic table, which is krypton (Kr).

To write the noble gas configuration of bromine, we use krypton as a shorthand and then add the remaining electron configuration.

Bromine's Electron Configuration

Bromine has an atomic number of 35, meaning it has 35 electrons. The full electron configuration of bromine is:

Noble Gas Notation

Using the noble gas shorthand, we replace the configuration up to krypton:

Here:

• $[Kr]$ represents the electron configuration of krypton: $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10}$.
• The configuration that follows, $4s^2 \, 3d^{10} \, 4p^5$, accounts for the remaining electrons.

Final Expression

Thus, the noble gas configuration of bromine is: