General Chemistry Question:

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Answer #1
Nitrogen has 5 valence electrons in an atom

Answer #2
3

Answer #3
5

Answer #4
5

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In Einsteins mass energy relation e=mc2 for what is c used or why is light required for reactions. Because the reactions are with help of neutrons?	Why PH scale range is 14? why it is not less or not greater than 14? solution of HCl or hydrogen containing liquid has a PH. but if the solution is KMnO4 here not hydrogen power does it PH?