Argon electron configuration

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Argon electron configuration
Argon electron configuration | Image: Learnool

The argon electron configuration, denoted as [Ne] 3s2 3p6 or 1s2 2s2 2p6 3s2 3p6, showcases the precise arrangement 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 argon atom
Periodic table | Image: Learnool

The atomic number of argon represents the total number of electrons of argon. Since the atomic number of argon is 18, the total electrons of argon are 18.

  • 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 18 electrons.

According to the aufbau principle, 1s subshell is filled first and then 2s, 2p, 3s… and so on.

Use 2 electrons for 1s subshell | Image: Learnool

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 18 – 2 = 16 electrons left.

Use 2 electrons for 2s subshell | Image: Learnool

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 16 – 2 = 14 electrons left.

Use 6 electrons for 2p subshell | Image: Learnool

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 14 – 6 = 8 electrons left.

Use 2 electrons for 3s subshell | Image: Learnool

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 8 – 2 = 6 electrons left.

Use last 6 electrons for 3p subshell | Image: Learnool

After 3s subshell now comes 3p subshell. Each p-subshell can hold a maximum of 6 electrons, and we also have 6 electrons left, so we will use that 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.

Therefore, the final electron configuration of argon is 1s2 2s2 2p6 3s2 3p6. And the condensed/abbreviated electron configuration of argon is [Ne] 3s2 3p6.

Where, Ne is neon

Periodic table

  • First, get periodic table chart with spdf notation
Periodic table blocks | Image: Learnool

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 argon on periodic table

Argon is the p block element located in group 18 and period 3. Hence, mark the location of argon on the periodic table as follows:

Mark location of argon on periodic table | Image: Learnool
  • 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 argon.

Start from 1s and write till Ar for full electron configuration | Image: Learnool

So the electron configuration of argon will be 1s2 2s2 2p6 3s2 3p6.

Bohr model

Argon Bohr model | Image: Learnool

In the above image, 1 represents the 1st electron shell. Similarly, 2 represents the 2nd electron shell, and 3 represents the 3rd electron shell.

The 1st electron shell contains 1s subshell, the 2nd electron shell contains 2s and 2p subshells, and the 3rd electron shell contains 3s and 3p subshells.

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 argon will be 1s2 2s2 2p6 3s2 3p6.

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

Orbital diagram

Argon orbital diagram | Image: Learnool

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, and the 3p subshell has 6 electrons.

So the electron configuration of argon will be 1s2 2s2 2p6 3s2 3p6.

Next: Gallium electron configuration

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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.

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