Answer
\[_{Z}^{A}\text{X}\] and \[\text{X-}A\]
Work Step by Step
The isotope of a substance is represented as follows:
\[_{Z}^{A}\text{X}\]
Here, \[\text{X}\]is the chemical symbol of the element, \[A\] is the mass number and \[Z\] is the atomic number.
Isotopes are also represented as: \[X-A\] where X represents chemical symbol and A represents mass number of the isotopes.
