【 】How many valence electrons does the representative element with the electron configuration 1s2 2s2 2p6 3s2 3p5 possess?

  How many valence electrons

 does the representative

 element with the electron

 configuration 1s2 2s2 2p6 3s2

 3p5 possess?

Answer:
The representative element with the electron configuration 1s2 2s2 2p6 3s2 3p5 possess seven valence electrons.

Explanation:

Given electron configuration is the electron configuration 1s2 2s2 2p6 3s2 3p5 .


Now identify the outermost shell or valence shell.Here the outermost shell or valence shell is 3s2 3p5 .

After that, count the number of electrons present in the outermost shell or valence shell . Here we are getting seven electrons (2+5 = 7 ).So, The representative element with the electron configuration 1s2 2s2 2p6 3s2 3p5 possess seven valence electrons..




 


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