Question

example of elements having same atomic number but different atomic mass​

Answer 1

Cl-35 and Cl-37. these are two isotopes of chlorine that exist in nature

Answer 2

In nature some elements only have a single isotope. For example, fluorine 19F is the only stable isotope, of several, of fluorine. Other elements have many isotopes. For example, xenon has 9 isotopes. Of the 81 elements with a stable isotope, the largest number of stable isotopes for any element is ten (for the element tin).