the number of protons in an element X is 15 and the number of neutrons is 16. Write the notation of the element

Dear student,
we will use the following relations to solve the problem:
Z=p=e
A= p+n
Where, Z= atomic no. ; p= no. Of protons ; n =no. of neutrons
A= atomic mass. 
Atomic no. of X = 15
Mass no. of X = 15+16=31
Atomic no. is written as subscript and mass no. as superscript so representation of the element is X1531
Regards

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  1531X
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X31 15
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