How many valence electrons are in the element with the following electron configuration 1s2 2s2 2p6 3s2 3p4?

In the element with the  electron configuration 
1s2 2s2 2p6 3s2 3p4 has 6 valence electrons.

Explanation:

From 1s2 2s2 2p6 3s2 3p4 ,we see that the highest value of n is 3 ,for n=3 ,we get 3s2 3p4 .We know that the highest value of n indicates the valence shell and the electrons that are in valence shell are called valence electrons.So, the element with the  electron configuration 1s2 2s2 2p6 3s2 3p4 has (2+4=6) 6 valence electrons.

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