Final answer:
The number of protons in the isotope is 44.
Step-by-step explanation:
The atomic number represents the number of protons in an atom, while the mass number represents the sum of the protons and neutrons. In this case, the isotope has 5 neutrons and a mass number of 49.
To determine the number of protons, subtract the number of neutrons from the mass number: 49 - 5 = 44.