Which atom in the ground state has five electrons in its outee level and ten electrons in its kernel (1) c (2) cl (3) si (4) p

If you use its electronic structure the last number should be a five so something like (2,5), (2,8,5) or (2,8,8,5) etc. 

The elements therefore with 5 as it's final number and 5 on the outer orbit are N, P, As, Sb, Bi, Uup. Therefore with the answers given to you the answer is most likely 4) Phosphorus.  

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