Question

the mass number and atomic number of an element are 200 and 80 give its correct representation

Answer 1

See atomic no. is written down and atomic mass above.

So correct representation is

                                          200  

                                 Hg  

                                            80

                                                                                         

Answer 2

mass number is written above and atomic number is written below the symbol of the element.
200
Hg
80
is the correct answer