Question

The sum of protons and neutrons is same in?​

Answer 1

Sum of protons and neutrons means the atomic mass of the element.
Therefore two elements having same atomic mass means that they are ISOTOPES.
Ans:- ISOTOPES

Answer 2

Answer:The mass number of a atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).