【】 1s2 2s2 2p6 3s2 3p5 valence electrons ||How many valence electrons are there in 1s2 2s2 2p6 3s2 3p5 ?

How many valence electrons does 1s2 2s2 2p6 3s2 3p5 have?





To find out valence electrons from 1s2 2s2 2p6 3s2 3p5,we will do the following steps:

    
              Step-1:

We need to identify valence shell by the principal quantum number (n)of highest value.

From 1s2 2s2 2p6 3s2 3p5,the highest value of n is 3.

So, third shell is the valence shell and the electrons in 3rd shell is called valence electrons.
                      Step-2:
Now we need to add all the valence electrons.

In 3rd shell,we are getting 3s2 3p5 .

If I add all the valence electrons,we get 2 + 5 = 8 valence electrons in 1s2 2s2 2p6 3s2 3p5.



【】 1s2 2s2 2p6 3s2 3p5 valence electrons ||How many valence electrons are there in 1s2 2s2 2p6 3s2 3p5 ?


From 1s2 2s2 2p6 3s2 3p5, we get totally 17 electrons.Among these 17 electrons, only 7 electrons are called valence electrons that are situated in the outermost shell (3s2 3p5).

1s2 2s2 2p6 3s2 3p5 is the electron configuration of chlorine.




 

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