I find it difficult to learn valencies.

Is there an easier way to learn it ???

I want to know it quickly as my exams are coming !!!

Hi Rishabh,

Valency is not a very difficult thing to learn or I must say that you also need not to. What you need to do is just to learn the elements with atomic number 20 and arrange them in the K, L, M and N shells.

The electrons present in the last shell determine the valency of a particular element.

If,

 

For your convenience, I am providing two examples to show how valency of any element can be found out.

If you consider the element ‘aluminium’ and try to write its electronic configuration, then it is 2, 8, 3 the valency is equal to 3.

However, for element ‘oxygen’ having electronic configuration 2, 6 the valency is 8 – 6 = 2.

 

I would suggest you to write the electronic configurations of the first 20 elements and try to find out the valency in the same way as shown above.

I am sure, you can do it. Just, practice this three times. You will achieve confidence in valency calculations if the atomic number is provided.

 

Do write to us, if you face any difficulty.

Good luck for your exams!!