. An element with mass number 81 contains

31.7% more neutrons as compared to protons. Assign the atomic symbol.


Best Answer


  • The mass number of an element is the sum of its protons and neutrons.
  • Let the number of protons of the element be x.
  • The number of neutrons is 31.7% more than the number of protons.

Therefore, the number of neutrons is  x+0.317x=1.317x.

  • The mass number of the element is 81.

1.317x + x=81



  • Therefore, the atomic number of this element= number of protons  = 35, which is Bromine.
  • Therefore, the atomic symbol is symbol  
  • Final answer:

Correct Answer is symbol


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