【】How to Write the Electron Configuration

Electron configuration of an element means the arrangement of electrons among different orbitals of that element.

Now we are going to know how to write electron configuration of any element of the periodic table.To write electron configuration of an element,we will follow just 5 steps.

                   Step-1:

To write electron configuration of any element,we have to know the atomic number of the element.For example,The atomic number of bromine is 35.So bromine has 35 electrons and 35 protons.Look how I find the electron configuration of this element.This process is applicable for all the elements of the periodic table.

                     
                      Step-2:

(How do you remember the order of electron configurations?)

Now we are bound 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 need  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 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 d 5p 6s 4f 5d 6p 7s 5f 6d 7p 8s 
6f 7d 8p 9s.........

How to Do Electron Configuration

               Step-4:
(What is spdf in electron configuration?
think--)

Now we 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.

How to Do or Find Electron Configuration

Then....

              Step-5:


Now we know that Bromine  has 35 electrons.

Electron configuration of bromine will be...


s² s²

p⁶s² p⁶s²

d¹ºp⁵s dps

fdps fdps fdps....

So,we are getting..


s² s²

p⁶s² p⁶s²

d¹ºp⁵


Now number s-orbital according  to above process.

1s² 2s²

p⁶ 3s² p⁶ 4s²

d¹º p⁵




Now number p-orbital according to above process.


1s² 2s²

2p⁶ 3s² 3p⁶ 4s²


d¹º 4p⁵



Now number d-orbital according to above process.


1s² 2s²

2p⁶ 3s² 3p⁶ 4s²



3d¹º 4p⁵



In a line---

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹º 4p⁵

So the electron configuration of bromine (Br) is given below:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹º 4p⁵

  
Remember that the electronic configuration of any element is written in the assending (low to high) order of  n.Finally,the above electronic configuration should be written according to value of n as follows.

         
Bromine Electron Configuration:

1s² 2s² 2p⁶ 3s² 3p⁶3d¹º  4s² 4p⁵

Releted Pages

Magic of Electron Configuration