Question

Electronic configuration of An element is 2 ;8;7 the Atomic number is and symbols

Answer 1

hi

here is your answer

electronic  configuration of an element is 2,8,7

   which means 1s²2s²2p⁶3s²3p⁵

hence it's atomic number is 17                  Chlorine

                               n=3

                                l=1

                               m=-1,0,1

                               ms=-1/2

hope this helps you

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Answer 2

Answer:

hi friend the element with atomic number  17 is chlorine and the symbol is Cl

Explanation:

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