【】 1s2 2s2 2p6 3s2 3p1 valence electrons ||How many valence electrons are there in 1s2 2s2 2p6 3s2 3p1 ?

 How many valence electrons does 1s2 2s2 2p6 3s2 3p1 have?

Answer:

To find out valence electrons from 1s2 2s2 2p6 3s2 3p1,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 3p1,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 3p1 .

If I add all the valence electrons,we get 2 + 1 = 3 valence electrons in 1s2 2s2 2p6 3s2 3p1.

From 1s2 2s2 2p6 3s2 3p1, we get totally 13 electrons.Among these 13 electrons, only 3 electrons are called valence electrons that are situated in the outermost shell (3s2 3p1).

1s2 2s2 2p6 3s2 3p1 is the electron configuration of aluminum.

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Questions and Answers

●How many shells are in 1s2 2s2 2p6 3s2 3p1?

Answer:

There are three shells in 1s2 2s2 2p6 3s2 3p1.

●First shell

1s2

●Second shell

2s22p6

●3rd shell

3s23p1