【 】How many valance electrons does an element with the electron configuration 1s2 2s2 2p5 have?

 How many valance electrons does an element with the electron configuration 1s2 2s2 2p5 have?


Answer:
An element with the electron configuration 1s2 2s2 2p5 has seven valence electrons.

Explanation:

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

Now identify the outermost shell or valence shell.Here the outermost shell or valence shell is 2s2 2p5 .

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, an element with the electron configuration 1s2 2s2 2p5 has seven valence electrons.




 



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