![Bromine electron configuration](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration.jpeg)
The bromine electron configuration, denoted as [Ar] 4s2 3d10 4p5 or 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5, showcases the precise placement of electrons within the atom. This configuration can be determined through various methods, including the aufbau principle, periodic table organization, Bohr model representation, or orbital diagram visualization.
Methods
Aufbau principle
- First, find electrons of bromine atom
![](https://learnool.com/wp-content/uploads/2021/09/Periodic-Table.jpeg)
The atomic number of bromine represents the total number of electrons of bromine. Since the atomic number of bromine is 35, the total electrons of bromine are 35.
- Second, make a table of subshell and its maximum electrons
Calculate the maximum number of electrons each subshell can hold using the formula: 4ℓ + 2
Where, ℓ = azimuthal quantum number of the subshell
For s subshell, ℓ = 0
For p subshell, ℓ = 1
For d subshell, ℓ = 2
For f subshell, ℓ = 3
subshell | max. electrons |
s | 2 |
p | 6 |
d | 10 |
f | 14 |
This means that,
Each s subshell can hold maximum 2 electrons
Each p subshell can hold maximum 6 electrons
Each d subshell can hold maximum 10 electrons
Each f subshell can hold maximum 14 electrons
- Finally, use aufbau chart and start writing electron configuration
Remember that we have a total of 35 electrons.
According to the aufbau principle, 1s subshell is filled first and then 2s, 2p, 3s… and so on.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-1.jpeg)
By looking at the chart, you can see that electrons are first filled in 1s subshell. Each s-subshell can hold a maximum of 2 electrons, so we will use 2 electrons for the 1s subshell.
So the electron configuration will be 1s2. Where, 1s2 indicates that the 1s subshell has 2 electrons.
Now we have used 2 electrons in the 1s subshell, so we have a total of 35 – 2 = 33 electrons left.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-2.jpeg)
Looking at the chart, after 1s subshell now comes 2s subshell. Again, each s-subshell can hold a maximum of 2 electrons, so we will use 2 electrons for the 2s subshell.
So the electron configuration will be 1s2 2s2. Where, 2s2 indicates that the 2s subshell has 2 electrons.
Again, we have used 2 electrons in the 2s subshell, so we have a total of 33 – 2 = 31 electrons left.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-3.jpeg)
After 2s subshell now comes 2p subshell. Each p-subshell can hold a maximum of 6 electrons, so we will use 6 electrons for the 2p subshell.
So the electron configuration will be 1s2 2s2 2p6. Where, 2p6 indicates that the 2p subshell has 6 electrons.
Here, we have used 6 electrons in the 2p subshell, so we have a total of 31 – 6 = 25 electrons left.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-4.jpeg)
After 2p subshell now comes 3s subshell. Each s-subshell can hold a maximum of 2 electrons, so we will use 2 electrons for the 3s subshell.
So the electron configuration will be 1s2 2s2 2p6 3s2. Where, 3s2 indicates that the 3s subshell has 2 electrons.
Here, we have used 2 electrons in the 3s subshell, so we have a total of 25 – 2 = 23 electrons left.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-5.jpeg)
After 3s subshell now comes 3p subshell. Each p-subshell can hold a maximum of 6 electrons, so we will use 6 electrons for the 3p subshell.
So the electron configuration will be 1s2 2s2 2p6 3s2 3p6. Where, 3p6 indicates that the 3p subshell has 6 electrons.
Here, we have used 6 electrons in the 3p subshell, so we have a total of 23 – 6 = 17 electrons left.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-6.jpeg)
After 3p subshell now comes 4s subshell. Each s-subshell can hold a maximum of 2 electrons, so we will use 2 electrons for the 4s subshell.
So the electron configuration will be 1s2 2s2 2p6 3s2 3p6 4s2. Where, 4s2 indicates that the 4s subshell has 2 electrons.
Here, we have used 2 electrons in the 4s subshell, so we have a total of 17 – 2 = 15 electrons left.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-7.jpeg)
After 4s subshell now comes 3d subshell. Each d-subshell can hold a maximum of 10 electrons, so we will use 10 electrons for the 3d subshell.
So the electron configuration will be 1s2 2s2 2p6 3s2 3p6 4s2 3d10. Where, 3d10 indicates that the 3d subshell has 10 electrons.
Here, we have used 10 electrons in the 3d subshell, so we have a total of 15 – 10 = 5 electrons left.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Electron-Configuration-Step-8.jpeg)
After 3d subshell now comes 4p subshell. Each p-subshell can hold a maximum of 6 electrons, but here we have only 5 electrons left, so we will use that 5 electrons for the 4p subshell.
So the electron configuration will be 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. Where, 4p5 indicates that the 4p subshell has 5 electrons.
Therefore, the final electron configuration of bromine is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. And the condensed/abbreviated electron configuration of bromine is [Ar] 4s2 3d10 4p5.
Where, Ar is argon
Periodic table
- First, get periodic table chart with spdf notation
![](https://learnool.com/wp-content/uploads/2022/06/Block-Periodic-Table.jpg)
The above image shows periodic table blocks.
The ‘s’ in s block represents that all s block elements have their valence electrons in s subshell. Similarly, the ‘p’ in p block represents that all p block elements have their valence electrons in p subshell. And so on for d block and f block.
- Second, mark location of bromine on periodic table
Bromine is the p block element located in group 17 and period 4. Hence, mark the location of bromine on the periodic table as follows:
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Periodic-Table-Step-1.jpeg)
- Finally, start writing electron configuration
Remember that: each s subshell can hold maximum 2 electrons, each p subshell can hold maximum 6 electrons, each d subshell can hold maximum 10 electrons, and each f subshell can hold maximum 14 electrons.
Start writing electron configuration from the very first element (i.e., hydrogen) all the way up to bromine.
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Periodic-Table-Step-2.jpeg)
So the electron configuration of bromine will be 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5.
Bohr model
![](https://learnool.com/wp-content/uploads/2022/06/Bromine-Bohr-Model.jpeg)
In the above image, 1 represents the 1st electron shell. Similarly, 2 represents the 2nd electron shell, 3 represents the 3rd electron shell, and 4 represents the 4th electron shell.
The 1st electron shell contains 1s subshell, the 2nd electron shell contains 2s and 2p subshells, the 3rd electron shell contains 3s, 3p, and 3d subshells, and the 4th electron shell contains 4s subshell.
We know that each s subshell can hold maximum 2 electrons, each p subshell can hold maximum 6 electrons, each d subshell can hold maximum 10 electrons, and each f subshell can hold maximum 14 electrons.
Also, we have to make sure that the electron configuration will match the order of aufbau principle (i.e., the 1s subshell is filled first and then 2s, 2p, 3s… and so on).
So the electron configuration of bromine will be 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5.
Where,
1s2 indicates that the 1s subshell has 2 electrons
2s2 indicates that the 2s subshell has 2 electrons
2p6 indicates that the 2p subshell has 6 electrons
3s2 indicates that the 3s subshell has 2 electrons
3p6 indicates that the 3p subshell has 6 electrons
4s2 indicates that the 4s subshell has 2 electrons
3d10 indicates that the 3d subshell has 10 electrons
4p5 indicates that the 4p subshell has 5 electrons
Learn how to draw: Bromine Bohr model
Orbital diagram
![](https://learnool.com/wp-content/uploads/2022/07/Bromine-Orbital-Diagram.jpeg)
The above orbital diagram shows that the 1s subshell has 2 electrons, the 2s subshell has 2 electrons, the 2p subshell has 6 electrons, the 3s subshell has 2 electrons, the 3p subshell has 6 electrons, the 4s subshell has 2 electrons, the 3d subshell has 10 electrons, and the 4p subshell has 5 electrons.
So the electron configuration of bromine will be 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5.
Learn how to draw: Bromine orbital diagram
Next: Tin electron configuration
Related
More topics
- Bromine
- Bromine Bohr model
- Bromine orbital diagram
- Bromine protons neutrons electrons
- Bromine valence electrons
External links
- https://socratic.org/questions/electronic-configuration-of-bromine
- https://valenceelectrons.com/bromine-electron-configuration/
- https://materials.gelsonluz.com/2019/08/electron-configuration-of-bromine-br.html
Deep
Learnool.com was founded by Deep Rana, who is a mechanical engineer by profession and a blogger by passion. He has a good conceptual knowledge on different educational topics and he provides the same on this website. He loves to learn something new everyday and believes that the best utilization of free time is developing a new skill.