Electronic Configuration of Argon (Ar)

Answer:

Electronic Configuration of Argon (Ar) is 1s² 2s² 2p⁶ 3s² 3p⁶.

We are going to write the electronic configuration of Argon(Ar) in just 5 Steps.

Step-1:

We know that the atomic number of Argon(Ar) is 18.So Argon has 18 electrons and 18 protons.

Step-2:

Now we have to try to memorize the following sequence of the orbitals.

ss

ps ps

dps dps

fdps fdps fdps fdps....

In a line-

ss ps ps dps dps fdps fdps

fdps fdps fdps fdps.......

Step-3:

Now we have to first numer the s-orbital (start with 1s)like this:

1s2s

p3s p 4s

dp 5s dp 6s

fdp7s fdp 8s...... According to your need.

In a line-

1s2s  p3s p 4s dp 5s dp 6s

fdp7s fdp 8s........

Remember● s-orbital start with 1s

● p-orbital start with 2p

● d-orbital start with 3d
● f-orbital start with 4f

Again,now(second) we have to number the p-orbital(start with 2p) like this:

ss

2ps 3ps

d 4ps d 5ps

fd6ps fd7ps fd8ps fd9ps....

In a line--

ss  2ps 3ps  d4ps d5ps

fd6ps fd7ps fd8ps fd9ps....

Thirdly, we need to number the d-orbital(start with 3d)like this:

ss

ps ps

3dps 4dps

f5dps f6dps f7dps f8dps....

In a line--

ss ps ps 3dps 4dps

f5dps f6dps f7dps f8dps....

Fourthly,number the f-orbital(start with 4f) like this:

ss

ps ps

dps dps

4fdps 5fdps 6fdps 7fdps....

In a line--

ss  ps ps dps dps  4fdps 5fdps 6fdps 7fdps......

Fifltly,number s,p,d,f together like this....

1s2s

2p3s 3p4s

3d4p5s 4d5p6s

4f5d6p7s 5f6d7p8s

6f7d8p9s.........

In a line----

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p8s
6f 7d 8p 9s.........

Step-4:

You have to know that

•S-orbital can take maximum 2 electrons.

•p-orbital can take maximum 6 electrons.

•d-orbital can take maximum 10 electrons.

•f-orbital can take maximum 14 electrons.

Step-5:

Now we know that Argon has 18 electrons.

Electronic configuration of Argon(Ar) will be...

s² s²

p⁶s² p⁶s

dps dps

fdps fdps fdps....

So,we are getting this.....

s² s²

p⁶s² p⁶

Now number s-orbital(start with 1s) according to the above process.

1s² 2s²

p⁶ 3s² p⁶

Now number p-orbital(Start with 2p) according to above process.

1s² 2s²

2p⁶ 3s² 3p⁶

In a line(Consider s,p)

1s² 2s² 2p⁶ 3s² 3p⁶